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drm/i915: Remove extra error state NULL
[deliverable/linux.git] / drivers / gpu / drm / i915 / i915_irq.c
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1/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
2 */
3/*
4 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 */
28
29#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31#include <linux/sysrq.h>
32#include <linux/slab.h>
33#include <drm/drmP.h>
34#include <drm/i915_drm.h>
35#include "i915_drv.h"
36#include "i915_trace.h"
37#include "intel_drv.h"
38
39static const u32 hpd_ibx[] = {
40 [HPD_CRT] = SDE_CRT_HOTPLUG,
41 [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG,
42 [HPD_PORT_B] = SDE_PORTB_HOTPLUG,
43 [HPD_PORT_C] = SDE_PORTC_HOTPLUG,
44 [HPD_PORT_D] = SDE_PORTD_HOTPLUG
45};
46
47static const u32 hpd_cpt[] = {
48 [HPD_CRT] = SDE_CRT_HOTPLUG_CPT,
49 [HPD_SDVO_B] = SDE_SDVOB_HOTPLUG_CPT,
50 [HPD_PORT_B] = SDE_PORTB_HOTPLUG_CPT,
51 [HPD_PORT_C] = SDE_PORTC_HOTPLUG_CPT,
52 [HPD_PORT_D] = SDE_PORTD_HOTPLUG_CPT
53};
54
55static const u32 hpd_mask_i915[] = {
56 [HPD_CRT] = CRT_HOTPLUG_INT_EN,
57 [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_EN,
58 [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_EN,
59 [HPD_PORT_B] = PORTB_HOTPLUG_INT_EN,
60 [HPD_PORT_C] = PORTC_HOTPLUG_INT_EN,
61 [HPD_PORT_D] = PORTD_HOTPLUG_INT_EN
62};
63
64static const u32 hpd_status_gen4[] = {
65 [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
66 [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_G4X,
67 [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_G4X,
68 [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
69 [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
70 [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
71};
72
73static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
74 [HPD_CRT] = CRT_HOTPLUG_INT_STATUS,
75 [HPD_SDVO_B] = SDVOB_HOTPLUG_INT_STATUS_I915,
76 [HPD_SDVO_C] = SDVOC_HOTPLUG_INT_STATUS_I915,
77 [HPD_PORT_B] = PORTB_HOTPLUG_INT_STATUS,
78 [HPD_PORT_C] = PORTC_HOTPLUG_INT_STATUS,
79 [HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
80};
81
82/* For display hotplug interrupt */
83static void
84ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
85{
86 assert_spin_locked(&dev_priv->irq_lock);
87
88 if ((dev_priv->irq_mask & mask) != 0) {
89 dev_priv->irq_mask &= ~mask;
90 I915_WRITE(DEIMR, dev_priv->irq_mask);
91 POSTING_READ(DEIMR);
92 }
93}
94
95static void
96ironlake_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
97{
98 assert_spin_locked(&dev_priv->irq_lock);
99
100 if ((dev_priv->irq_mask & mask) != mask) {
101 dev_priv->irq_mask |= mask;
102 I915_WRITE(DEIMR, dev_priv->irq_mask);
103 POSTING_READ(DEIMR);
104 }
105}
106
107static bool ivb_can_enable_err_int(struct drm_device *dev)
108{
109 struct drm_i915_private *dev_priv = dev->dev_private;
110 struct intel_crtc *crtc;
111 enum pipe pipe;
112
113 assert_spin_locked(&dev_priv->irq_lock);
114
115 for_each_pipe(pipe) {
116 crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
117
118 if (crtc->cpu_fifo_underrun_disabled)
119 return false;
120 }
121
122 return true;
123}
124
125static bool cpt_can_enable_serr_int(struct drm_device *dev)
126{
127 struct drm_i915_private *dev_priv = dev->dev_private;
128 enum pipe pipe;
129 struct intel_crtc *crtc;
130
131 for_each_pipe(pipe) {
132 crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
133
134 if (crtc->pch_fifo_underrun_disabled)
135 return false;
136 }
137
138 return true;
139}
140
141static void ironlake_set_fifo_underrun_reporting(struct drm_device *dev,
142 enum pipe pipe, bool enable)
143{
144 struct drm_i915_private *dev_priv = dev->dev_private;
145 uint32_t bit = (pipe == PIPE_A) ? DE_PIPEA_FIFO_UNDERRUN :
146 DE_PIPEB_FIFO_UNDERRUN;
147
148 if (enable)
149 ironlake_enable_display_irq(dev_priv, bit);
150 else
151 ironlake_disable_display_irq(dev_priv, bit);
152}
153
154static void ivybridge_set_fifo_underrun_reporting(struct drm_device *dev,
155 bool enable)
156{
157 struct drm_i915_private *dev_priv = dev->dev_private;
158
159 if (enable) {
160 if (!ivb_can_enable_err_int(dev))
161 return;
162
163 I915_WRITE(GEN7_ERR_INT, ERR_INT_FIFO_UNDERRUN_A |
164 ERR_INT_FIFO_UNDERRUN_B |
165 ERR_INT_FIFO_UNDERRUN_C);
166
167 ironlake_enable_display_irq(dev_priv, DE_ERR_INT_IVB);
168 } else {
169 ironlake_disable_display_irq(dev_priv, DE_ERR_INT_IVB);
170 }
171}
172
173static void ibx_set_fifo_underrun_reporting(struct intel_crtc *crtc,
174 bool enable)
175{
176 struct drm_device *dev = crtc->base.dev;
177 struct drm_i915_private *dev_priv = dev->dev_private;
178 uint32_t bit = (crtc->pipe == PIPE_A) ? SDE_TRANSA_FIFO_UNDER :
179 SDE_TRANSB_FIFO_UNDER;
180
181 if (enable)
182 I915_WRITE(SDEIMR, I915_READ(SDEIMR) & ~bit);
183 else
184 I915_WRITE(SDEIMR, I915_READ(SDEIMR) | bit);
185
186 POSTING_READ(SDEIMR);
187}
188
189static void cpt_set_fifo_underrun_reporting(struct drm_device *dev,
190 enum transcoder pch_transcoder,
191 bool enable)
192{
193 struct drm_i915_private *dev_priv = dev->dev_private;
194
195 if (enable) {
196 if (!cpt_can_enable_serr_int(dev))
197 return;
198
199 I915_WRITE(SERR_INT, SERR_INT_TRANS_A_FIFO_UNDERRUN |
200 SERR_INT_TRANS_B_FIFO_UNDERRUN |
201 SERR_INT_TRANS_C_FIFO_UNDERRUN);
202
203 I915_WRITE(SDEIMR, I915_READ(SDEIMR) & ~SDE_ERROR_CPT);
204 } else {
205 I915_WRITE(SDEIMR, I915_READ(SDEIMR) | SDE_ERROR_CPT);
206 }
207
208 POSTING_READ(SDEIMR);
209}
210
211/**
212 * intel_set_cpu_fifo_underrun_reporting - enable/disable FIFO underrun messages
213 * @dev: drm device
214 * @pipe: pipe
215 * @enable: true if we want to report FIFO underrun errors, false otherwise
216 *
217 * This function makes us disable or enable CPU fifo underruns for a specific
218 * pipe. Notice that on some Gens (e.g. IVB, HSW), disabling FIFO underrun
219 * reporting for one pipe may also disable all the other CPU error interruts for
220 * the other pipes, due to the fact that there's just one interrupt mask/enable
221 * bit for all the pipes.
222 *
223 * Returns the previous state of underrun reporting.
224 */
225bool intel_set_cpu_fifo_underrun_reporting(struct drm_device *dev,
226 enum pipe pipe, bool enable)
227{
228 struct drm_i915_private *dev_priv = dev->dev_private;
229 struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
230 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
231 unsigned long flags;
232 bool ret;
233
234 spin_lock_irqsave(&dev_priv->irq_lock, flags);
235
236 ret = !intel_crtc->cpu_fifo_underrun_disabled;
237
238 if (enable == ret)
239 goto done;
240
241 intel_crtc->cpu_fifo_underrun_disabled = !enable;
242
243 if (IS_GEN5(dev) || IS_GEN6(dev))
244 ironlake_set_fifo_underrun_reporting(dev, pipe, enable);
245 else if (IS_GEN7(dev))
246 ivybridge_set_fifo_underrun_reporting(dev, enable);
247
248done:
249 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
250 return ret;
251}
252
253/**
254 * intel_set_pch_fifo_underrun_reporting - enable/disable FIFO underrun messages
255 * @dev: drm device
256 * @pch_transcoder: the PCH transcoder (same as pipe on IVB and older)
257 * @enable: true if we want to report FIFO underrun errors, false otherwise
258 *
259 * This function makes us disable or enable PCH fifo underruns for a specific
260 * PCH transcoder. Notice that on some PCHs (e.g. CPT/PPT), disabling FIFO
261 * underrun reporting for one transcoder may also disable all the other PCH
262 * error interruts for the other transcoders, due to the fact that there's just
263 * one interrupt mask/enable bit for all the transcoders.
264 *
265 * Returns the previous state of underrun reporting.
266 */
267bool intel_set_pch_fifo_underrun_reporting(struct drm_device *dev,
268 enum transcoder pch_transcoder,
269 bool enable)
270{
271 struct drm_i915_private *dev_priv = dev->dev_private;
272 enum pipe p;
273 struct drm_crtc *crtc;
274 struct intel_crtc *intel_crtc;
275 unsigned long flags;
276 bool ret;
277
278 if (HAS_PCH_LPT(dev)) {
279 crtc = NULL;
280 for_each_pipe(p) {
281 struct drm_crtc *c = dev_priv->pipe_to_crtc_mapping[p];
282 if (intel_pipe_has_type(c, INTEL_OUTPUT_ANALOG)) {
283 crtc = c;
284 break;
285 }
286 }
287 if (!crtc) {
288 DRM_ERROR("PCH FIFO underrun, but no CRTC using the PCH found\n");
289 return false;
290 }
291 } else {
292 crtc = dev_priv->pipe_to_crtc_mapping[pch_transcoder];
293 }
294 intel_crtc = to_intel_crtc(crtc);
295
296 spin_lock_irqsave(&dev_priv->irq_lock, flags);
297
298 ret = !intel_crtc->pch_fifo_underrun_disabled;
299
300 if (enable == ret)
301 goto done;
302
303 intel_crtc->pch_fifo_underrun_disabled = !enable;
304
305 if (HAS_PCH_IBX(dev))
306 ibx_set_fifo_underrun_reporting(intel_crtc, enable);
307 else
308 cpt_set_fifo_underrun_reporting(dev, pch_transcoder, enable);
309
310done:
311 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
312 return ret;
313}
314
315
316void
317i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
318{
319 u32 reg = PIPESTAT(pipe);
320 u32 pipestat = I915_READ(reg) & 0x7fff0000;
321
322 if ((pipestat & mask) == mask)
323 return;
324
325 /* Enable the interrupt, clear any pending status */
326 pipestat |= mask | (mask >> 16);
327 I915_WRITE(reg, pipestat);
328 POSTING_READ(reg);
329}
330
331void
332i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
333{
334 u32 reg = PIPESTAT(pipe);
335 u32 pipestat = I915_READ(reg) & 0x7fff0000;
336
337 if ((pipestat & mask) == 0)
338 return;
339
340 pipestat &= ~mask;
341 I915_WRITE(reg, pipestat);
342 POSTING_READ(reg);
343}
344
345/**
346 * i915_enable_asle_pipestat - enable ASLE pipestat for OpRegion
347 */
348static void i915_enable_asle_pipestat(struct drm_device *dev)
349{
350 drm_i915_private_t *dev_priv = dev->dev_private;
351 unsigned long irqflags;
352
353 if (!dev_priv->opregion.asle || !IS_MOBILE(dev))
354 return;
355
356 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
357
358 i915_enable_pipestat(dev_priv, 1, PIPE_LEGACY_BLC_EVENT_ENABLE);
359 if (INTEL_INFO(dev)->gen >= 4)
360 i915_enable_pipestat(dev_priv, 0, PIPE_LEGACY_BLC_EVENT_ENABLE);
361
362 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
363}
364
365/**
366 * i915_pipe_enabled - check if a pipe is enabled
367 * @dev: DRM device
368 * @pipe: pipe to check
369 *
370 * Reading certain registers when the pipe is disabled can hang the chip.
371 * Use this routine to make sure the PLL is running and the pipe is active
372 * before reading such registers if unsure.
373 */
374static int
375i915_pipe_enabled(struct drm_device *dev, int pipe)
376{
377 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
378
379 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
380 /* Locking is horribly broken here, but whatever. */
381 struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
382 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
383
384 return intel_crtc->active;
385 } else {
386 return I915_READ(PIPECONF(pipe)) & PIPECONF_ENABLE;
387 }
388}
389
390/* Called from drm generic code, passed a 'crtc', which
391 * we use as a pipe index
392 */
393static u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
394{
395 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
396 unsigned long high_frame;
397 unsigned long low_frame;
398 u32 high1, high2, low;
399
400 if (!i915_pipe_enabled(dev, pipe)) {
401 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
402 "pipe %c\n", pipe_name(pipe));
403 return 0;
404 }
405
406 high_frame = PIPEFRAME(pipe);
407 low_frame = PIPEFRAMEPIXEL(pipe);
408
409 /*
410 * High & low register fields aren't synchronized, so make sure
411 * we get a low value that's stable across two reads of the high
412 * register.
413 */
414 do {
415 high1 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
416 low = I915_READ(low_frame) & PIPE_FRAME_LOW_MASK;
417 high2 = I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK;
418 } while (high1 != high2);
419
420 high1 >>= PIPE_FRAME_HIGH_SHIFT;
421 low >>= PIPE_FRAME_LOW_SHIFT;
422 return (high1 << 8) | low;
423}
424
425static u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
426{
427 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
428 int reg = PIPE_FRMCOUNT_GM45(pipe);
429
430 if (!i915_pipe_enabled(dev, pipe)) {
431 DRM_DEBUG_DRIVER("trying to get vblank count for disabled "
432 "pipe %c\n", pipe_name(pipe));
433 return 0;
434 }
435
436 return I915_READ(reg);
437}
438
439static int i915_get_crtc_scanoutpos(struct drm_device *dev, int pipe,
440 int *vpos, int *hpos)
441{
442 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
443 u32 vbl = 0, position = 0;
444 int vbl_start, vbl_end, htotal, vtotal;
445 bool in_vbl = true;
446 int ret = 0;
447 enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
448 pipe);
449
450 if (!i915_pipe_enabled(dev, pipe)) {
451 DRM_DEBUG_DRIVER("trying to get scanoutpos for disabled "
452 "pipe %c\n", pipe_name(pipe));
453 return 0;
454 }
455
456 /* Get vtotal. */
457 vtotal = 1 + ((I915_READ(VTOTAL(cpu_transcoder)) >> 16) & 0x1fff);
458
459 if (INTEL_INFO(dev)->gen >= 4) {
460 /* No obvious pixelcount register. Only query vertical
461 * scanout position from Display scan line register.
462 */
463 position = I915_READ(PIPEDSL(pipe));
464
465 /* Decode into vertical scanout position. Don't have
466 * horizontal scanout position.
467 */
468 *vpos = position & 0x1fff;
469 *hpos = 0;
470 } else {
471 /* Have access to pixelcount since start of frame.
472 * We can split this into vertical and horizontal
473 * scanout position.
474 */
475 position = (I915_READ(PIPEFRAMEPIXEL(pipe)) & PIPE_PIXEL_MASK) >> PIPE_PIXEL_SHIFT;
476
477 htotal = 1 + ((I915_READ(HTOTAL(cpu_transcoder)) >> 16) & 0x1fff);
478 *vpos = position / htotal;
479 *hpos = position - (*vpos * htotal);
480 }
481
482 /* Query vblank area. */
483 vbl = I915_READ(VBLANK(cpu_transcoder));
484
485 /* Test position against vblank region. */
486 vbl_start = vbl & 0x1fff;
487 vbl_end = (vbl >> 16) & 0x1fff;
488
489 if ((*vpos < vbl_start) || (*vpos > vbl_end))
490 in_vbl = false;
491
492 /* Inside "upper part" of vblank area? Apply corrective offset: */
493 if (in_vbl && (*vpos >= vbl_start))
494 *vpos = *vpos - vtotal;
495
496 /* Readouts valid? */
497 if (vbl > 0)
498 ret |= DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_ACCURATE;
499
500 /* In vblank? */
501 if (in_vbl)
502 ret |= DRM_SCANOUTPOS_INVBL;
503
504 return ret;
505}
506
507static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
508 int *max_error,
509 struct timeval *vblank_time,
510 unsigned flags)
511{
512 struct drm_crtc *crtc;
513
514 if (pipe < 0 || pipe >= INTEL_INFO(dev)->num_pipes) {
515 DRM_ERROR("Invalid crtc %d\n", pipe);
516 return -EINVAL;
517 }
518
519 /* Get drm_crtc to timestamp: */
520 crtc = intel_get_crtc_for_pipe(dev, pipe);
521 if (crtc == NULL) {
522 DRM_ERROR("Invalid crtc %d\n", pipe);
523 return -EINVAL;
524 }
525
526 if (!crtc->enabled) {
527 DRM_DEBUG_KMS("crtc %d is disabled\n", pipe);
528 return -EBUSY;
529 }
530
531 /* Helper routine in DRM core does all the work: */
532 return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,
533 vblank_time, flags,
534 crtc);
535}
536
537static int intel_hpd_irq_event(struct drm_device *dev, struct drm_connector *connector)
538{
539 enum drm_connector_status old_status;
540
541 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
542 old_status = connector->status;
543
544 connector->status = connector->funcs->detect(connector, false);
545 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
546 connector->base.id,
547 drm_get_connector_name(connector),
548 old_status, connector->status);
549 return (old_status != connector->status);
550}
551
552/*
553 * Handle hotplug events outside the interrupt handler proper.
554 */
555#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
556
557static void i915_hotplug_work_func(struct work_struct *work)
558{
559 drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
560 hotplug_work);
561 struct drm_device *dev = dev_priv->dev;
562 struct drm_mode_config *mode_config = &dev->mode_config;
563 struct intel_connector *intel_connector;
564 struct intel_encoder *intel_encoder;
565 struct drm_connector *connector;
566 unsigned long irqflags;
567 bool hpd_disabled = false;
568 bool changed = false;
569 u32 hpd_event_bits;
570
571 /* HPD irq before everything is fully set up. */
572 if (!dev_priv->enable_hotplug_processing)
573 return;
574
575 mutex_lock(&mode_config->mutex);
576 DRM_DEBUG_KMS("running encoder hotplug functions\n");
577
578 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
579
580 hpd_event_bits = dev_priv->hpd_event_bits;
581 dev_priv->hpd_event_bits = 0;
582 list_for_each_entry(connector, &mode_config->connector_list, head) {
583 intel_connector = to_intel_connector(connector);
584 intel_encoder = intel_connector->encoder;
585 if (intel_encoder->hpd_pin > HPD_NONE &&
586 dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_MARK_DISABLED &&
587 connector->polled == DRM_CONNECTOR_POLL_HPD) {
588 DRM_INFO("HPD interrupt storm detected on connector %s: "
589 "switching from hotplug detection to polling\n",
590 drm_get_connector_name(connector));
591 dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark = HPD_DISABLED;
592 connector->polled = DRM_CONNECTOR_POLL_CONNECT
593 | DRM_CONNECTOR_POLL_DISCONNECT;
594 hpd_disabled = true;
595 }
596 if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
597 DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
598 drm_get_connector_name(connector), intel_encoder->hpd_pin);
599 }
600 }
601 /* if there were no outputs to poll, poll was disabled,
602 * therefore make sure it's enabled when disabling HPD on
603 * some connectors */
604 if (hpd_disabled) {
605 drm_kms_helper_poll_enable(dev);
606 mod_timer(&dev_priv->hotplug_reenable_timer,
607 jiffies + msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY));
608 }
609
610 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
611
612 list_for_each_entry(connector, &mode_config->connector_list, head) {
613 intel_connector = to_intel_connector(connector);
614 intel_encoder = intel_connector->encoder;
615 if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
616 if (intel_encoder->hot_plug)
617 intel_encoder->hot_plug(intel_encoder);
618 if (intel_hpd_irq_event(dev, connector))
619 changed = true;
620 }
621 }
622 mutex_unlock(&mode_config->mutex);
623
624 if (changed)
625 drm_kms_helper_hotplug_event(dev);
626}
627
628static void ironlake_handle_rps_change(struct drm_device *dev)
629{
630 drm_i915_private_t *dev_priv = dev->dev_private;
631 u32 busy_up, busy_down, max_avg, min_avg;
632 u8 new_delay;
633 unsigned long flags;
634
635 spin_lock_irqsave(&mchdev_lock, flags);
636
637 I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));
638
639 new_delay = dev_priv->ips.cur_delay;
640
641 I915_WRITE16(MEMINTRSTS, MEMINT_EVAL_CHG);
642 busy_up = I915_READ(RCPREVBSYTUPAVG);
643 busy_down = I915_READ(RCPREVBSYTDNAVG);
644 max_avg = I915_READ(RCBMAXAVG);
645 min_avg = I915_READ(RCBMINAVG);
646
647 /* Handle RCS change request from hw */
648 if (busy_up > max_avg) {
649 if (dev_priv->ips.cur_delay != dev_priv->ips.max_delay)
650 new_delay = dev_priv->ips.cur_delay - 1;
651 if (new_delay < dev_priv->ips.max_delay)
652 new_delay = dev_priv->ips.max_delay;
653 } else if (busy_down < min_avg) {
654 if (dev_priv->ips.cur_delay != dev_priv->ips.min_delay)
655 new_delay = dev_priv->ips.cur_delay + 1;
656 if (new_delay > dev_priv->ips.min_delay)
657 new_delay = dev_priv->ips.min_delay;
658 }
659
660 if (ironlake_set_drps(dev, new_delay))
661 dev_priv->ips.cur_delay = new_delay;
662
663 spin_unlock_irqrestore(&mchdev_lock, flags);
664
665 return;
666}
667
668static void notify_ring(struct drm_device *dev,
669 struct intel_ring_buffer *ring)
670{
671 struct drm_i915_private *dev_priv = dev->dev_private;
672
673 if (ring->obj == NULL)
674 return;
675
676 trace_i915_gem_request_complete(ring, ring->get_seqno(ring, false));
677
678 wake_up_all(&ring->irq_queue);
679 if (i915_enable_hangcheck) {
680 mod_timer(&dev_priv->gpu_error.hangcheck_timer,
681 round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES));
682 }
683}
684
685static void gen6_pm_rps_work(struct work_struct *work)
686{
687 drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
688 rps.work);
689 u32 pm_iir, pm_imr;
690 u8 new_delay;
691
692 spin_lock_irq(&dev_priv->rps.lock);
693 pm_iir = dev_priv->rps.pm_iir;
694 dev_priv->rps.pm_iir = 0;
695 pm_imr = I915_READ(GEN6_PMIMR);
696 /* Make sure not to corrupt PMIMR state used by ringbuffer code */
697 I915_WRITE(GEN6_PMIMR, pm_imr & ~GEN6_PM_RPS_EVENTS);
698 spin_unlock_irq(&dev_priv->rps.lock);
699
700 if ((pm_iir & GEN6_PM_RPS_EVENTS) == 0)
701 return;
702
703 mutex_lock(&dev_priv->rps.hw_lock);
704
705 if (pm_iir & GEN6_PM_RP_UP_THRESHOLD) {
706 new_delay = dev_priv->rps.cur_delay + 1;
707
708 /*
709 * For better performance, jump directly
710 * to RPe if we're below it.
711 */
712 if (IS_VALLEYVIEW(dev_priv->dev) &&
713 dev_priv->rps.cur_delay < dev_priv->rps.rpe_delay)
714 new_delay = dev_priv->rps.rpe_delay;
715 } else
716 new_delay = dev_priv->rps.cur_delay - 1;
717
718 /* sysfs frequency interfaces may have snuck in while servicing the
719 * interrupt
720 */
721 if (new_delay >= dev_priv->rps.min_delay &&
722 new_delay <= dev_priv->rps.max_delay) {
723 if (IS_VALLEYVIEW(dev_priv->dev))
724 valleyview_set_rps(dev_priv->dev, new_delay);
725 else
726 gen6_set_rps(dev_priv->dev, new_delay);
727 }
728
729 if (IS_VALLEYVIEW(dev_priv->dev)) {
730 /*
731 * On VLV, when we enter RC6 we may not be at the minimum
732 * voltage level, so arm a timer to check. It should only
733 * fire when there's activity or once after we've entered
734 * RC6, and then won't be re-armed until the next RPS interrupt.
735 */
736 mod_delayed_work(dev_priv->wq, &dev_priv->rps.vlv_work,
737 msecs_to_jiffies(100));
738 }
739
740 mutex_unlock(&dev_priv->rps.hw_lock);
741}
742
743
744/**
745 * ivybridge_parity_work - Workqueue called when a parity error interrupt
746 * occurred.
747 * @work: workqueue struct
748 *
749 * Doesn't actually do anything except notify userspace. As a consequence of
750 * this event, userspace should try to remap the bad rows since statistically
751 * it is likely the same row is more likely to go bad again.
752 */
753static void ivybridge_parity_work(struct work_struct *work)
754{
755 drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
756 l3_parity.error_work);
757 u32 error_status, row, bank, subbank;
758 char *parity_event[5];
759 uint32_t misccpctl;
760 unsigned long flags;
761
762 /* We must turn off DOP level clock gating to access the L3 registers.
763 * In order to prevent a get/put style interface, acquire struct mutex
764 * any time we access those registers.
765 */
766 mutex_lock(&dev_priv->dev->struct_mutex);
767
768 misccpctl = I915_READ(GEN7_MISCCPCTL);
769 I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
770 POSTING_READ(GEN7_MISCCPCTL);
771
772 error_status = I915_READ(GEN7_L3CDERRST1);
773 row = GEN7_PARITY_ERROR_ROW(error_status);
774 bank = GEN7_PARITY_ERROR_BANK(error_status);
775 subbank = GEN7_PARITY_ERROR_SUBBANK(error_status);
776
777 I915_WRITE(GEN7_L3CDERRST1, GEN7_PARITY_ERROR_VALID |
778 GEN7_L3CDERRST1_ENABLE);
779 POSTING_READ(GEN7_L3CDERRST1);
780
781 I915_WRITE(GEN7_MISCCPCTL, misccpctl);
782
783 spin_lock_irqsave(&dev_priv->irq_lock, flags);
784 dev_priv->gt_irq_mask &= ~GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
785 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
786 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
787
788 mutex_unlock(&dev_priv->dev->struct_mutex);
789
790 parity_event[0] = "L3_PARITY_ERROR=1";
791 parity_event[1] = kasprintf(GFP_KERNEL, "ROW=%d", row);
792 parity_event[2] = kasprintf(GFP_KERNEL, "BANK=%d", bank);
793 parity_event[3] = kasprintf(GFP_KERNEL, "SUBBANK=%d", subbank);
794 parity_event[4] = NULL;
795
796 kobject_uevent_env(&dev_priv->dev->primary->kdev.kobj,
797 KOBJ_CHANGE, parity_event);
798
799 DRM_DEBUG("Parity error: Row = %d, Bank = %d, Sub bank = %d.\n",
800 row, bank, subbank);
801
802 kfree(parity_event[3]);
803 kfree(parity_event[2]);
804 kfree(parity_event[1]);
805}
806
807static void ivybridge_handle_parity_error(struct drm_device *dev)
808{
809 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
810 unsigned long flags;
811
812 if (!HAS_L3_GPU_CACHE(dev))
813 return;
814
815 spin_lock_irqsave(&dev_priv->irq_lock, flags);
816 dev_priv->gt_irq_mask |= GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
817 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
818 spin_unlock_irqrestore(&dev_priv->irq_lock, flags);
819
820 queue_work(dev_priv->wq, &dev_priv->l3_parity.error_work);
821}
822
823static void snb_gt_irq_handler(struct drm_device *dev,
824 struct drm_i915_private *dev_priv,
825 u32 gt_iir)
826{
827
828 if (gt_iir &
829 (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT))
830 notify_ring(dev, &dev_priv->ring[RCS]);
831 if (gt_iir & GT_BSD_USER_INTERRUPT)
832 notify_ring(dev, &dev_priv->ring[VCS]);
833 if (gt_iir & GT_BLT_USER_INTERRUPT)
834 notify_ring(dev, &dev_priv->ring[BCS]);
835
836 if (gt_iir & (GT_BLT_CS_ERROR_INTERRUPT |
837 GT_BSD_CS_ERROR_INTERRUPT |
838 GT_RENDER_CS_MASTER_ERROR_INTERRUPT)) {
839 DRM_ERROR("GT error interrupt 0x%08x\n", gt_iir);
840 i915_handle_error(dev, false);
841 }
842
843 if (gt_iir & GT_RENDER_L3_PARITY_ERROR_INTERRUPT)
844 ivybridge_handle_parity_error(dev);
845}
846
847/* Legacy way of handling PM interrupts */
848static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
849 u32 pm_iir)
850{
851 unsigned long flags;
852
853 /*
854 * IIR bits should never already be set because IMR should
855 * prevent an interrupt from being shown in IIR. The warning
856 * displays a case where we've unsafely cleared
857 * dev_priv->rps.pm_iir. Although missing an interrupt of the same
858 * type is not a problem, it displays a problem in the logic.
859 *
860 * The mask bit in IMR is cleared by dev_priv->rps.work.
861 */
862
863 spin_lock_irqsave(&dev_priv->rps.lock, flags);
864 dev_priv->rps.pm_iir |= pm_iir;
865 I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
866 POSTING_READ(GEN6_PMIMR);
867 spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
868
869 queue_work(dev_priv->wq, &dev_priv->rps.work);
870}
871
872#define HPD_STORM_DETECT_PERIOD 1000
873#define HPD_STORM_THRESHOLD 5
874
875static inline void intel_hpd_irq_handler(struct drm_device *dev,
876 u32 hotplug_trigger,
877 const u32 *hpd)
878{
879 drm_i915_private_t *dev_priv = dev->dev_private;
880 int i;
881 bool storm_detected = false;
882
883 if (!hotplug_trigger)
884 return;
885
886 spin_lock(&dev_priv->irq_lock);
887 for (i = 1; i < HPD_NUM_PINS; i++) {
888
889 if (!(hpd[i] & hotplug_trigger) ||
890 dev_priv->hpd_stats[i].hpd_mark != HPD_ENABLED)
891 continue;
892
893 dev_priv->hpd_event_bits |= (1 << i);
894 if (!time_in_range(jiffies, dev_priv->hpd_stats[i].hpd_last_jiffies,
895 dev_priv->hpd_stats[i].hpd_last_jiffies
896 + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD))) {
897 dev_priv->hpd_stats[i].hpd_last_jiffies = jiffies;
898 dev_priv->hpd_stats[i].hpd_cnt = 0;
899 } else if (dev_priv->hpd_stats[i].hpd_cnt > HPD_STORM_THRESHOLD) {
900 dev_priv->hpd_stats[i].hpd_mark = HPD_MARK_DISABLED;
901 dev_priv->hpd_event_bits &= ~(1 << i);
902 DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", i);
903 storm_detected = true;
904 } else {
905 dev_priv->hpd_stats[i].hpd_cnt++;
906 }
907 }
908
909 if (storm_detected)
910 dev_priv->display.hpd_irq_setup(dev);
911 spin_unlock(&dev_priv->irq_lock);
912
913 queue_work(dev_priv->wq,
914 &dev_priv->hotplug_work);
915}
916
917static void gmbus_irq_handler(struct drm_device *dev)
918{
919 struct drm_i915_private *dev_priv = (drm_i915_private_t *) dev->dev_private;
920
921 wake_up_all(&dev_priv->gmbus_wait_queue);
922}
923
924static void dp_aux_irq_handler(struct drm_device *dev)
925{
926 struct drm_i915_private *dev_priv = (drm_i915_private_t *) dev->dev_private;
927
928 wake_up_all(&dev_priv->gmbus_wait_queue);
929}
930
931/* Unlike gen6_queue_rps_work() from which this function is originally derived,
932 * we must be able to deal with other PM interrupts. This is complicated because
933 * of the way in which we use the masks to defer the RPS work (which for
934 * posterity is necessary because of forcewake).
935 */
936static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
937 u32 pm_iir)
938{
939 unsigned long flags;
940
941 spin_lock_irqsave(&dev_priv->rps.lock, flags);
942 dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS;
943 if (dev_priv->rps.pm_iir) {
944 I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
945 /* never want to mask useful interrupts. (also posting read) */
946 WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_RPS_EVENTS);
947 /* TODO: if queue_work is slow, move it out of the spinlock */
948 queue_work(dev_priv->wq, &dev_priv->rps.work);
949 }
950 spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
951
952 if (pm_iir & ~GEN6_PM_RPS_EVENTS) {
953 if (pm_iir & PM_VEBOX_USER_INTERRUPT)
954 notify_ring(dev_priv->dev, &dev_priv->ring[VECS]);
955
956 if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) {
957 DRM_ERROR("VEBOX CS error interrupt 0x%08x\n", pm_iir);
958 i915_handle_error(dev_priv->dev, false);
959 }
960 }
961}
962
963static irqreturn_t valleyview_irq_handler(int irq, void *arg)
964{
965 struct drm_device *dev = (struct drm_device *) arg;
966 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
967 u32 iir, gt_iir, pm_iir;
968 irqreturn_t ret = IRQ_NONE;
969 unsigned long irqflags;
970 int pipe;
971 u32 pipe_stats[I915_MAX_PIPES];
972
973 atomic_inc(&dev_priv->irq_received);
974
975 while (true) {
976 iir = I915_READ(VLV_IIR);
977 gt_iir = I915_READ(GTIIR);
978 pm_iir = I915_READ(GEN6_PMIIR);
979
980 if (gt_iir == 0 && pm_iir == 0 && iir == 0)
981 goto out;
982
983 ret = IRQ_HANDLED;
984
985 snb_gt_irq_handler(dev, dev_priv, gt_iir);
986
987 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
988 for_each_pipe(pipe) {
989 int reg = PIPESTAT(pipe);
990 pipe_stats[pipe] = I915_READ(reg);
991
992 /*
993 * Clear the PIPE*STAT regs before the IIR
994 */
995 if (pipe_stats[pipe] & 0x8000ffff) {
996 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
997 DRM_DEBUG_DRIVER("pipe %c underrun\n",
998 pipe_name(pipe));
999 I915_WRITE(reg, pipe_stats[pipe]);
1000 }
1001 }
1002 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
1003
1004 for_each_pipe(pipe) {
1005 if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
1006 drm_handle_vblank(dev, pipe);
1007
1008 if (pipe_stats[pipe] & PLANE_FLIPDONE_INT_STATUS_VLV) {
1009 intel_prepare_page_flip(dev, pipe);
1010 intel_finish_page_flip(dev, pipe);
1011 }
1012 }
1013
1014 /* Consume port. Then clear IIR or we'll miss events */
1015 if (iir & I915_DISPLAY_PORT_INTERRUPT) {
1016 u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
1017 u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
1018
1019 DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
1020 hotplug_status);
1021
1022 intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
1023
1024 I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
1025 I915_READ(PORT_HOTPLUG_STAT);
1026 }
1027
1028 if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
1029 gmbus_irq_handler(dev);
1030
1031 if (pm_iir & GEN6_PM_RPS_EVENTS)
1032 gen6_queue_rps_work(dev_priv, pm_iir);
1033
1034 I915_WRITE(GTIIR, gt_iir);
1035 I915_WRITE(GEN6_PMIIR, pm_iir);
1036 I915_WRITE(VLV_IIR, iir);
1037 }
1038
1039out:
1040 return ret;
1041}
1042
1043static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
1044{
1045 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1046 int pipe;
1047 u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
1048
1049 intel_hpd_irq_handler(dev, hotplug_trigger, hpd_ibx);
1050
1051 if (pch_iir & SDE_AUDIO_POWER_MASK) {
1052 int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
1053 SDE_AUDIO_POWER_SHIFT);
1054 DRM_DEBUG_DRIVER("PCH audio power change on port %d\n",
1055 port_name(port));
1056 }
1057
1058 if (pch_iir & SDE_AUX_MASK)
1059 dp_aux_irq_handler(dev);
1060
1061 if (pch_iir & SDE_GMBUS)
1062 gmbus_irq_handler(dev);
1063
1064 if (pch_iir & SDE_AUDIO_HDCP_MASK)
1065 DRM_DEBUG_DRIVER("PCH HDCP audio interrupt\n");
1066
1067 if (pch_iir & SDE_AUDIO_TRANS_MASK)
1068 DRM_DEBUG_DRIVER("PCH transcoder audio interrupt\n");
1069
1070 if (pch_iir & SDE_POISON)
1071 DRM_ERROR("PCH poison interrupt\n");
1072
1073 if (pch_iir & SDE_FDI_MASK)
1074 for_each_pipe(pipe)
1075 DRM_DEBUG_DRIVER(" pipe %c FDI IIR: 0x%08x\n",
1076 pipe_name(pipe),
1077 I915_READ(FDI_RX_IIR(pipe)));
1078
1079 if (pch_iir & (SDE_TRANSB_CRC_DONE | SDE_TRANSA_CRC_DONE))
1080 DRM_DEBUG_DRIVER("PCH transcoder CRC done interrupt\n");
1081
1082 if (pch_iir & (SDE_TRANSB_CRC_ERR | SDE_TRANSA_CRC_ERR))
1083 DRM_DEBUG_DRIVER("PCH transcoder CRC error interrupt\n");
1084
1085 if (pch_iir & SDE_TRANSA_FIFO_UNDER)
1086 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A,
1087 false))
1088 DRM_DEBUG_DRIVER("PCH transcoder A FIFO underrun\n");
1089
1090 if (pch_iir & SDE_TRANSB_FIFO_UNDER)
1091 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_B,
1092 false))
1093 DRM_DEBUG_DRIVER("PCH transcoder B FIFO underrun\n");
1094}
1095
1096static void ivb_err_int_handler(struct drm_device *dev)
1097{
1098 struct drm_i915_private *dev_priv = dev->dev_private;
1099 u32 err_int = I915_READ(GEN7_ERR_INT);
1100
1101 if (err_int & ERR_INT_POISON)
1102 DRM_ERROR("Poison interrupt\n");
1103
1104 if (err_int & ERR_INT_FIFO_UNDERRUN_A)
1105 if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_A, false))
1106 DRM_DEBUG_DRIVER("Pipe A FIFO underrun\n");
1107
1108 if (err_int & ERR_INT_FIFO_UNDERRUN_B)
1109 if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_B, false))
1110 DRM_DEBUG_DRIVER("Pipe B FIFO underrun\n");
1111
1112 if (err_int & ERR_INT_FIFO_UNDERRUN_C)
1113 if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_C, false))
1114 DRM_DEBUG_DRIVER("Pipe C FIFO underrun\n");
1115
1116 I915_WRITE(GEN7_ERR_INT, err_int);
1117}
1118
1119static void cpt_serr_int_handler(struct drm_device *dev)
1120{
1121 struct drm_i915_private *dev_priv = dev->dev_private;
1122 u32 serr_int = I915_READ(SERR_INT);
1123
1124 if (serr_int & SERR_INT_POISON)
1125 DRM_ERROR("PCH poison interrupt\n");
1126
1127 if (serr_int & SERR_INT_TRANS_A_FIFO_UNDERRUN)
1128 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_A,
1129 false))
1130 DRM_DEBUG_DRIVER("PCH transcoder A FIFO underrun\n");
1131
1132 if (serr_int & SERR_INT_TRANS_B_FIFO_UNDERRUN)
1133 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_B,
1134 false))
1135 DRM_DEBUG_DRIVER("PCH transcoder B FIFO underrun\n");
1136
1137 if (serr_int & SERR_INT_TRANS_C_FIFO_UNDERRUN)
1138 if (intel_set_pch_fifo_underrun_reporting(dev, TRANSCODER_C,
1139 false))
1140 DRM_DEBUG_DRIVER("PCH transcoder C FIFO underrun\n");
1141
1142 I915_WRITE(SERR_INT, serr_int);
1143}
1144
1145static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
1146{
1147 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1148 int pipe;
1149 u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
1150
1151 intel_hpd_irq_handler(dev, hotplug_trigger, hpd_cpt);
1152
1153 if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
1154 int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
1155 SDE_AUDIO_POWER_SHIFT_CPT);
1156 DRM_DEBUG_DRIVER("PCH audio power change on port %c\n",
1157 port_name(port));
1158 }
1159
1160 if (pch_iir & SDE_AUX_MASK_CPT)
1161 dp_aux_irq_handler(dev);
1162
1163 if (pch_iir & SDE_GMBUS_CPT)
1164 gmbus_irq_handler(dev);
1165
1166 if (pch_iir & SDE_AUDIO_CP_REQ_CPT)
1167 DRM_DEBUG_DRIVER("Audio CP request interrupt\n");
1168
1169 if (pch_iir & SDE_AUDIO_CP_CHG_CPT)
1170 DRM_DEBUG_DRIVER("Audio CP change interrupt\n");
1171
1172 if (pch_iir & SDE_FDI_MASK_CPT)
1173 for_each_pipe(pipe)
1174 DRM_DEBUG_DRIVER(" pipe %c FDI IIR: 0x%08x\n",
1175 pipe_name(pipe),
1176 I915_READ(FDI_RX_IIR(pipe)));
1177
1178 if (pch_iir & SDE_ERROR_CPT)
1179 cpt_serr_int_handler(dev);
1180}
1181
1182static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
1183{
1184 struct drm_device *dev = (struct drm_device *) arg;
1185 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1186 u32 de_iir, gt_iir, de_ier, pm_iir, sde_ier = 0;
1187 irqreturn_t ret = IRQ_NONE;
1188 int i;
1189
1190 atomic_inc(&dev_priv->irq_received);
1191
1192 /* We get interrupts on unclaimed registers, so check for this before we
1193 * do any I915_{READ,WRITE}. */
1194 if (IS_HASWELL(dev) &&
1195 (I915_READ_NOTRACE(FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
1196 DRM_ERROR("Unclaimed register before interrupt\n");
1197 I915_WRITE_NOTRACE(FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
1198 }
1199
1200 /* disable master interrupt before clearing iir */
1201 de_ier = I915_READ(DEIER);
1202 I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
1203
1204 /* Disable south interrupts. We'll only write to SDEIIR once, so further
1205 * interrupts will will be stored on its back queue, and then we'll be
1206 * able to process them after we restore SDEIER (as soon as we restore
1207 * it, we'll get an interrupt if SDEIIR still has something to process
1208 * due to its back queue). */
1209 if (!HAS_PCH_NOP(dev)) {
1210 sde_ier = I915_READ(SDEIER);
1211 I915_WRITE(SDEIER, 0);
1212 POSTING_READ(SDEIER);
1213 }
1214
1215 /* On Haswell, also mask ERR_INT because we don't want to risk
1216 * generating "unclaimed register" interrupts from inside the interrupt
1217 * handler. */
1218 if (IS_HASWELL(dev)) {
1219 spin_lock(&dev_priv->irq_lock);
1220 ironlake_disable_display_irq(dev_priv, DE_ERR_INT_IVB);
1221 spin_unlock(&dev_priv->irq_lock);
1222 }
1223
1224 gt_iir = I915_READ(GTIIR);
1225 if (gt_iir) {
1226 snb_gt_irq_handler(dev, dev_priv, gt_iir);
1227 I915_WRITE(GTIIR, gt_iir);
1228 ret = IRQ_HANDLED;
1229 }
1230
1231 de_iir = I915_READ(DEIIR);
1232 if (de_iir) {
1233 if (de_iir & DE_ERR_INT_IVB)
1234 ivb_err_int_handler(dev);
1235
1236 if (de_iir & DE_AUX_CHANNEL_A_IVB)
1237 dp_aux_irq_handler(dev);
1238
1239 if (de_iir & DE_GSE_IVB)
1240 intel_opregion_asle_intr(dev);
1241
1242 for (i = 0; i < 3; i++) {
1243 if (de_iir & (DE_PIPEA_VBLANK_IVB << (5 * i)))
1244 drm_handle_vblank(dev, i);
1245 if (de_iir & (DE_PLANEA_FLIP_DONE_IVB << (5 * i))) {
1246 intel_prepare_page_flip(dev, i);
1247 intel_finish_page_flip_plane(dev, i);
1248 }
1249 }
1250
1251 /* check event from PCH */
1252 if (!HAS_PCH_NOP(dev) && (de_iir & DE_PCH_EVENT_IVB)) {
1253 u32 pch_iir = I915_READ(SDEIIR);
1254
1255 cpt_irq_handler(dev, pch_iir);
1256
1257 /* clear PCH hotplug event before clear CPU irq */
1258 I915_WRITE(SDEIIR, pch_iir);
1259 }
1260
1261 I915_WRITE(DEIIR, de_iir);
1262 ret = IRQ_HANDLED;
1263 }
1264
1265 pm_iir = I915_READ(GEN6_PMIIR);
1266 if (pm_iir) {
1267 if (IS_HASWELL(dev))
1268 hsw_pm_irq_handler(dev_priv, pm_iir);
1269 else if (pm_iir & GEN6_PM_RPS_EVENTS)
1270 gen6_queue_rps_work(dev_priv, pm_iir);
1271 I915_WRITE(GEN6_PMIIR, pm_iir);
1272 ret = IRQ_HANDLED;
1273 }
1274
1275 if (IS_HASWELL(dev)) {
1276 spin_lock(&dev_priv->irq_lock);
1277 if (ivb_can_enable_err_int(dev))
1278 ironlake_enable_display_irq(dev_priv, DE_ERR_INT_IVB);
1279 spin_unlock(&dev_priv->irq_lock);
1280 }
1281
1282 I915_WRITE(DEIER, de_ier);
1283 POSTING_READ(DEIER);
1284 if (!HAS_PCH_NOP(dev)) {
1285 I915_WRITE(SDEIER, sde_ier);
1286 POSTING_READ(SDEIER);
1287 }
1288
1289 return ret;
1290}
1291
1292static void ilk_gt_irq_handler(struct drm_device *dev,
1293 struct drm_i915_private *dev_priv,
1294 u32 gt_iir)
1295{
1296 if (gt_iir &
1297 (GT_RENDER_USER_INTERRUPT | GT_RENDER_PIPECTL_NOTIFY_INTERRUPT))
1298 notify_ring(dev, &dev_priv->ring[RCS]);
1299 if (gt_iir & ILK_BSD_USER_INTERRUPT)
1300 notify_ring(dev, &dev_priv->ring[VCS]);
1301}
1302
1303static irqreturn_t ironlake_irq_handler(int irq, void *arg)
1304{
1305 struct drm_device *dev = (struct drm_device *) arg;
1306 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1307 int ret = IRQ_NONE;
1308 u32 de_iir, gt_iir, de_ier, pm_iir, sde_ier;
1309
1310 atomic_inc(&dev_priv->irq_received);
1311
1312 /* disable master interrupt before clearing iir */
1313 de_ier = I915_READ(DEIER);
1314 I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
1315 POSTING_READ(DEIER);
1316
1317 /* Disable south interrupts. We'll only write to SDEIIR once, so further
1318 * interrupts will will be stored on its back queue, and then we'll be
1319 * able to process them after we restore SDEIER (as soon as we restore
1320 * it, we'll get an interrupt if SDEIIR still has something to process
1321 * due to its back queue). */
1322 sde_ier = I915_READ(SDEIER);
1323 I915_WRITE(SDEIER, 0);
1324 POSTING_READ(SDEIER);
1325
1326 de_iir = I915_READ(DEIIR);
1327 gt_iir = I915_READ(GTIIR);
1328 pm_iir = I915_READ(GEN6_PMIIR);
1329
1330 if (de_iir == 0 && gt_iir == 0 && (!IS_GEN6(dev) || pm_iir == 0))
1331 goto done;
1332
1333 ret = IRQ_HANDLED;
1334
1335 if (IS_GEN5(dev))
1336 ilk_gt_irq_handler(dev, dev_priv, gt_iir);
1337 else
1338 snb_gt_irq_handler(dev, dev_priv, gt_iir);
1339
1340 if (de_iir & DE_AUX_CHANNEL_A)
1341 dp_aux_irq_handler(dev);
1342
1343 if (de_iir & DE_GSE)
1344 intel_opregion_asle_intr(dev);
1345
1346 if (de_iir & DE_PIPEA_VBLANK)
1347 drm_handle_vblank(dev, 0);
1348
1349 if (de_iir & DE_PIPEB_VBLANK)
1350 drm_handle_vblank(dev, 1);
1351
1352 if (de_iir & DE_POISON)
1353 DRM_ERROR("Poison interrupt\n");
1354
1355 if (de_iir & DE_PIPEA_FIFO_UNDERRUN)
1356 if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_A, false))
1357 DRM_DEBUG_DRIVER("Pipe A FIFO underrun\n");
1358
1359 if (de_iir & DE_PIPEB_FIFO_UNDERRUN)
1360 if (intel_set_cpu_fifo_underrun_reporting(dev, PIPE_B, false))
1361 DRM_DEBUG_DRIVER("Pipe B FIFO underrun\n");
1362
1363 if (de_iir & DE_PLANEA_FLIP_DONE) {
1364 intel_prepare_page_flip(dev, 0);
1365 intel_finish_page_flip_plane(dev, 0);
1366 }
1367
1368 if (de_iir & DE_PLANEB_FLIP_DONE) {
1369 intel_prepare_page_flip(dev, 1);
1370 intel_finish_page_flip_plane(dev, 1);
1371 }
1372
1373 /* check event from PCH */
1374 if (de_iir & DE_PCH_EVENT) {
1375 u32 pch_iir = I915_READ(SDEIIR);
1376
1377 if (HAS_PCH_CPT(dev))
1378 cpt_irq_handler(dev, pch_iir);
1379 else
1380 ibx_irq_handler(dev, pch_iir);
1381
1382 /* should clear PCH hotplug event before clear CPU irq */
1383 I915_WRITE(SDEIIR, pch_iir);
1384 }
1385
1386 if (IS_GEN5(dev) && de_iir & DE_PCU_EVENT)
1387 ironlake_handle_rps_change(dev);
1388
1389 if (IS_GEN6(dev) && pm_iir & GEN6_PM_RPS_EVENTS)
1390 gen6_queue_rps_work(dev_priv, pm_iir);
1391
1392 I915_WRITE(GTIIR, gt_iir);
1393 I915_WRITE(DEIIR, de_iir);
1394 I915_WRITE(GEN6_PMIIR, pm_iir);
1395
1396done:
1397 I915_WRITE(DEIER, de_ier);
1398 POSTING_READ(DEIER);
1399 I915_WRITE(SDEIER, sde_ier);
1400 POSTING_READ(SDEIER);
1401
1402 return ret;
1403}
1404
1405/**
1406 * i915_error_work_func - do process context error handling work
1407 * @work: work struct
1408 *
1409 * Fire an error uevent so userspace can see that a hang or error
1410 * was detected.
1411 */
1412static void i915_error_work_func(struct work_struct *work)
1413{
1414 struct i915_gpu_error *error = container_of(work, struct i915_gpu_error,
1415 work);
1416 drm_i915_private_t *dev_priv = container_of(error, drm_i915_private_t,
1417 gpu_error);
1418 struct drm_device *dev = dev_priv->dev;
1419 struct intel_ring_buffer *ring;
1420 char *error_event[] = { "ERROR=1", NULL };
1421 char *reset_event[] = { "RESET=1", NULL };
1422 char *reset_done_event[] = { "ERROR=0", NULL };
1423 int i, ret;
1424
1425 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, error_event);
1426
1427 /*
1428 * Note that there's only one work item which does gpu resets, so we
1429 * need not worry about concurrent gpu resets potentially incrementing
1430 * error->reset_counter twice. We only need to take care of another
1431 * racing irq/hangcheck declaring the gpu dead for a second time. A
1432 * quick check for that is good enough: schedule_work ensures the
1433 * correct ordering between hang detection and this work item, and since
1434 * the reset in-progress bit is only ever set by code outside of this
1435 * work we don't need to worry about any other races.
1436 */
1437 if (i915_reset_in_progress(error) && !i915_terminally_wedged(error)) {
1438 DRM_DEBUG_DRIVER("resetting chip\n");
1439 kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE,
1440 reset_event);
1441
1442 ret = i915_reset(dev);
1443
1444 if (ret == 0) {
1445 /*
1446 * After all the gem state is reset, increment the reset
1447 * counter and wake up everyone waiting for the reset to
1448 * complete.
1449 *
1450 * Since unlock operations are a one-sided barrier only,
1451 * we need to insert a barrier here to order any seqno
1452 * updates before
1453 * the counter increment.
1454 */
1455 smp_mb__before_atomic_inc();
1456 atomic_inc(&dev_priv->gpu_error.reset_counter);
1457
1458 kobject_uevent_env(&dev->primary->kdev.kobj,
1459 KOBJ_CHANGE, reset_done_event);
1460 } else {
1461 atomic_set(&error->reset_counter, I915_WEDGED);
1462 }
1463
1464 for_each_ring(ring, dev_priv, i)
1465 wake_up_all(&ring->irq_queue);
1466
1467 intel_display_handle_reset(dev);
1468
1469 wake_up_all(&dev_priv->gpu_error.reset_queue);
1470 }
1471}
1472
1473/* NB: please notice the memset */
1474static void i915_get_extra_instdone(struct drm_device *dev,
1475 uint32_t *instdone)
1476{
1477 struct drm_i915_private *dev_priv = dev->dev_private;
1478 memset(instdone, 0, sizeof(*instdone) * I915_NUM_INSTDONE_REG);
1479
1480 switch(INTEL_INFO(dev)->gen) {
1481 case 2:
1482 case 3:
1483 instdone[0] = I915_READ(INSTDONE);
1484 break;
1485 case 4:
1486 case 5:
1487 case 6:
1488 instdone[0] = I915_READ(INSTDONE_I965);
1489 instdone[1] = I915_READ(INSTDONE1);
1490 break;
1491 default:
1492 WARN_ONCE(1, "Unsupported platform\n");
1493 case 7:
1494 instdone[0] = I915_READ(GEN7_INSTDONE_1);
1495 instdone[1] = I915_READ(GEN7_SC_INSTDONE);
1496 instdone[2] = I915_READ(GEN7_SAMPLER_INSTDONE);
1497 instdone[3] = I915_READ(GEN7_ROW_INSTDONE);
1498 break;
1499 }
1500}
1501
1502#ifdef CONFIG_DEBUG_FS
1503static struct drm_i915_error_object *
1504i915_error_object_create_sized(struct drm_i915_private *dev_priv,
1505 struct drm_i915_gem_object *src,
1506 const int num_pages)
1507{
1508 struct drm_i915_error_object *dst;
1509 int i;
1510 u32 reloc_offset;
1511
1512 if (src == NULL || src->pages == NULL)
1513 return NULL;
1514
1515 dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *), GFP_ATOMIC);
1516 if (dst == NULL)
1517 return NULL;
1518
1519 reloc_offset = src->gtt_offset;
1520 for (i = 0; i < num_pages; i++) {
1521 unsigned long flags;
1522 void *d;
1523
1524 d = kmalloc(PAGE_SIZE, GFP_ATOMIC);
1525 if (d == NULL)
1526 goto unwind;
1527
1528 local_irq_save(flags);
1529 if (reloc_offset < dev_priv->gtt.mappable_end &&
1530 src->has_global_gtt_mapping) {
1531 void __iomem *s;
1532
1533 /* Simply ignore tiling or any overlapping fence.
1534 * It's part of the error state, and this hopefully
1535 * captures what the GPU read.
1536 */
1537
1538 s = io_mapping_map_atomic_wc(dev_priv->gtt.mappable,
1539 reloc_offset);
1540 memcpy_fromio(d, s, PAGE_SIZE);
1541 io_mapping_unmap_atomic(s);
1542 } else if (src->stolen) {
1543 unsigned long offset;
1544
1545 offset = dev_priv->mm.stolen_base;
1546 offset += src->stolen->start;
1547 offset += i << PAGE_SHIFT;
1548
1549 memcpy_fromio(d, (void __iomem *) offset, PAGE_SIZE);
1550 } else {
1551 struct page *page;
1552 void *s;
1553
1554 page = i915_gem_object_get_page(src, i);
1555
1556 drm_clflush_pages(&page, 1);
1557
1558 s = kmap_atomic(page);
1559 memcpy(d, s, PAGE_SIZE);
1560 kunmap_atomic(s);
1561
1562 drm_clflush_pages(&page, 1);
1563 }
1564 local_irq_restore(flags);
1565
1566 dst->pages[i] = d;
1567
1568 reloc_offset += PAGE_SIZE;
1569 }
1570 dst->page_count = num_pages;
1571 dst->gtt_offset = src->gtt_offset;
1572
1573 return dst;
1574
1575unwind:
1576 while (i--)
1577 kfree(dst->pages[i]);
1578 kfree(dst);
1579 return NULL;
1580}
1581#define i915_error_object_create(dev_priv, src) \
1582 i915_error_object_create_sized((dev_priv), (src), \
1583 (src)->base.size>>PAGE_SHIFT)
1584
1585static void
1586i915_error_object_free(struct drm_i915_error_object *obj)
1587{
1588 int page;
1589
1590 if (obj == NULL)
1591 return;
1592
1593 for (page = 0; page < obj->page_count; page++)
1594 kfree(obj->pages[page]);
1595
1596 kfree(obj);
1597}
1598
1599void
1600i915_error_state_free(struct kref *error_ref)
1601{
1602 struct drm_i915_error_state *error = container_of(error_ref,
1603 typeof(*error), ref);
1604 int i;
1605
1606 for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
1607 i915_error_object_free(error->ring[i].batchbuffer);
1608 i915_error_object_free(error->ring[i].ringbuffer);
1609 i915_error_object_free(error->ring[i].ctx);
1610 kfree(error->ring[i].requests);
1611 }
1612
1613 kfree(error->active_bo);
1614 kfree(error->overlay);
1615 kfree(error->display);
1616 kfree(error);
1617}
1618static void capture_bo(struct drm_i915_error_buffer *err,
1619 struct drm_i915_gem_object *obj)
1620{
1621 err->size = obj->base.size;
1622 err->name = obj->base.name;
1623 err->rseqno = obj->last_read_seqno;
1624 err->wseqno = obj->last_write_seqno;
1625 err->gtt_offset = obj->gtt_offset;
1626 err->read_domains = obj->base.read_domains;
1627 err->write_domain = obj->base.write_domain;
1628 err->fence_reg = obj->fence_reg;
1629 err->pinned = 0;
1630 if (obj->pin_count > 0)
1631 err->pinned = 1;
1632 if (obj->user_pin_count > 0)
1633 err->pinned = -1;
1634 err->tiling = obj->tiling_mode;
1635 err->dirty = obj->dirty;
1636 err->purgeable = obj->madv != I915_MADV_WILLNEED;
1637 err->ring = obj->ring ? obj->ring->id : -1;
1638 err->cache_level = obj->cache_level;
1639}
1640
1641static u32 capture_active_bo(struct drm_i915_error_buffer *err,
1642 int count, struct list_head *head)
1643{
1644 struct drm_i915_gem_object *obj;
1645 int i = 0;
1646
1647 list_for_each_entry(obj, head, mm_list) {
1648 capture_bo(err++, obj);
1649 if (++i == count)
1650 break;
1651 }
1652
1653 return i;
1654}
1655
1656static u32 capture_pinned_bo(struct drm_i915_error_buffer *err,
1657 int count, struct list_head *head)
1658{
1659 struct drm_i915_gem_object *obj;
1660 int i = 0;
1661
1662 list_for_each_entry(obj, head, global_list) {
1663 if (obj->pin_count == 0)
1664 continue;
1665
1666 capture_bo(err++, obj);
1667 if (++i == count)
1668 break;
1669 }
1670
1671 return i;
1672}
1673
1674static void i915_gem_record_fences(struct drm_device *dev,
1675 struct drm_i915_error_state *error)
1676{
1677 struct drm_i915_private *dev_priv = dev->dev_private;
1678 int i;
1679
1680 /* Fences */
1681 switch (INTEL_INFO(dev)->gen) {
1682 case 7:
1683 case 6:
1684 for (i = 0; i < dev_priv->num_fence_regs; i++)
1685 error->fence[i] = I915_READ64(FENCE_REG_SANDYBRIDGE_0 + (i * 8));
1686 break;
1687 case 5:
1688 case 4:
1689 for (i = 0; i < 16; i++)
1690 error->fence[i] = I915_READ64(FENCE_REG_965_0 + (i * 8));
1691 break;
1692 case 3:
1693 if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
1694 for (i = 0; i < 8; i++)
1695 error->fence[i+8] = I915_READ(FENCE_REG_945_8 + (i * 4));
1696 case 2:
1697 for (i = 0; i < 8; i++)
1698 error->fence[i] = I915_READ(FENCE_REG_830_0 + (i * 4));
1699 break;
1700
1701 default:
1702 BUG();
1703 }
1704}
1705
1706static struct drm_i915_error_object *
1707i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
1708 struct intel_ring_buffer *ring)
1709{
1710 struct drm_i915_gem_object *obj;
1711 u32 seqno;
1712
1713 if (!ring->get_seqno)
1714 return NULL;
1715
1716 if (HAS_BROKEN_CS_TLB(dev_priv->dev)) {
1717 u32 acthd = I915_READ(ACTHD);
1718
1719 if (WARN_ON(ring->id != RCS))
1720 return NULL;
1721
1722 obj = ring->private;
1723 if (acthd >= obj->gtt_offset &&
1724 acthd < obj->gtt_offset + obj->base.size)
1725 return i915_error_object_create(dev_priv, obj);
1726 }
1727
1728 seqno = ring->get_seqno(ring, false);
1729 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list) {
1730 if (obj->ring != ring)
1731 continue;
1732
1733 if (i915_seqno_passed(seqno, obj->last_read_seqno))
1734 continue;
1735
1736 if ((obj->base.read_domains & I915_GEM_DOMAIN_COMMAND) == 0)
1737 continue;
1738
1739 /* We need to copy these to an anonymous buffer as the simplest
1740 * method to avoid being overwritten by userspace.
1741 */
1742 return i915_error_object_create(dev_priv, obj);
1743 }
1744
1745 return NULL;
1746}
1747
1748static void i915_record_ring_state(struct drm_device *dev,
1749 struct drm_i915_error_state *error,
1750 struct intel_ring_buffer *ring)
1751{
1752 struct drm_i915_private *dev_priv = dev->dev_private;
1753
1754 if (INTEL_INFO(dev)->gen >= 6) {
1755 error->rc_psmi[ring->id] = I915_READ(ring->mmio_base + 0x50);
1756 error->fault_reg[ring->id] = I915_READ(RING_FAULT_REG(ring));
1757 error->semaphore_mboxes[ring->id][0]
1758 = I915_READ(RING_SYNC_0(ring->mmio_base));
1759 error->semaphore_mboxes[ring->id][1]
1760 = I915_READ(RING_SYNC_1(ring->mmio_base));
1761 error->semaphore_seqno[ring->id][0] = ring->sync_seqno[0];
1762 error->semaphore_seqno[ring->id][1] = ring->sync_seqno[1];
1763 }
1764
1765 if (INTEL_INFO(dev)->gen >= 4) {
1766 error->faddr[ring->id] = I915_READ(RING_DMA_FADD(ring->mmio_base));
1767 error->ipeir[ring->id] = I915_READ(RING_IPEIR(ring->mmio_base));
1768 error->ipehr[ring->id] = I915_READ(RING_IPEHR(ring->mmio_base));
1769 error->instdone[ring->id] = I915_READ(RING_INSTDONE(ring->mmio_base));
1770 error->instps[ring->id] = I915_READ(RING_INSTPS(ring->mmio_base));
1771 if (ring->id == RCS)
1772 error->bbaddr = I915_READ64(BB_ADDR);
1773 } else {
1774 error->faddr[ring->id] = I915_READ(DMA_FADD_I8XX);
1775 error->ipeir[ring->id] = I915_READ(IPEIR);
1776 error->ipehr[ring->id] = I915_READ(IPEHR);
1777 error->instdone[ring->id] = I915_READ(INSTDONE);
1778 }
1779
1780 error->waiting[ring->id] = waitqueue_active(&ring->irq_queue);
1781 error->instpm[ring->id] = I915_READ(RING_INSTPM(ring->mmio_base));
1782 error->seqno[ring->id] = ring->get_seqno(ring, false);
1783 error->acthd[ring->id] = intel_ring_get_active_head(ring);
1784 error->head[ring->id] = I915_READ_HEAD(ring);
1785 error->tail[ring->id] = I915_READ_TAIL(ring);
1786 error->ctl[ring->id] = I915_READ_CTL(ring);
1787
1788 error->cpu_ring_head[ring->id] = ring->head;
1789 error->cpu_ring_tail[ring->id] = ring->tail;
1790}
1791
1792
1793static void i915_gem_record_active_context(struct intel_ring_buffer *ring,
1794 struct drm_i915_error_state *error,
1795 struct drm_i915_error_ring *ering)
1796{
1797 struct drm_i915_private *dev_priv = ring->dev->dev_private;
1798 struct drm_i915_gem_object *obj;
1799
1800 /* Currently render ring is the only HW context user */
1801 if (ring->id != RCS || !error->ccid)
1802 return;
1803
1804 list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
1805 if ((error->ccid & PAGE_MASK) == obj->gtt_offset) {
1806 ering->ctx = i915_error_object_create_sized(dev_priv,
1807 obj, 1);
1808 break;
1809 }
1810 }
1811}
1812
1813static void i915_gem_record_rings(struct drm_device *dev,
1814 struct drm_i915_error_state *error)
1815{
1816 struct drm_i915_private *dev_priv = dev->dev_private;
1817 struct intel_ring_buffer *ring;
1818 struct drm_i915_gem_request *request;
1819 int i, count;
1820
1821 for_each_ring(ring, dev_priv, i) {
1822 i915_record_ring_state(dev, error, ring);
1823
1824 error->ring[i].batchbuffer =
1825 i915_error_first_batchbuffer(dev_priv, ring);
1826
1827 error->ring[i].ringbuffer =
1828 i915_error_object_create(dev_priv, ring->obj);
1829
1830
1831 i915_gem_record_active_context(ring, error, &error->ring[i]);
1832
1833 count = 0;
1834 list_for_each_entry(request, &ring->request_list, list)
1835 count++;
1836
1837 error->ring[i].num_requests = count;
1838 error->ring[i].requests =
1839 kmalloc(count*sizeof(struct drm_i915_error_request),
1840 GFP_ATOMIC);
1841 if (error->ring[i].requests == NULL) {
1842 error->ring[i].num_requests = 0;
1843 continue;
1844 }
1845
1846 count = 0;
1847 list_for_each_entry(request, &ring->request_list, list) {
1848 struct drm_i915_error_request *erq;
1849
1850 erq = &error->ring[i].requests[count++];
1851 erq->seqno = request->seqno;
1852 erq->jiffies = request->emitted_jiffies;
1853 erq->tail = request->tail;
1854 }
1855 }
1856}
1857
1858/**
1859 * i915_capture_error_state - capture an error record for later analysis
1860 * @dev: drm device
1861 *
1862 * Should be called when an error is detected (either a hang or an error
1863 * interrupt) to capture error state from the time of the error. Fills
1864 * out a structure which becomes available in debugfs for user level tools
1865 * to pick up.
1866 */
1867static void i915_capture_error_state(struct drm_device *dev)
1868{
1869 struct drm_i915_private *dev_priv = dev->dev_private;
1870 struct drm_i915_gem_object *obj;
1871 struct drm_i915_error_state *error;
1872 unsigned long flags;
1873 int i, pipe;
1874
1875 spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1876 error = dev_priv->gpu_error.first_error;
1877 spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1878 if (error)
1879 return;
1880
1881 /* Account for pipe specific data like PIPE*STAT */
1882 error = kzalloc(sizeof(*error), GFP_ATOMIC);
1883 if (!error) {
1884 DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
1885 return;
1886 }
1887
1888 DRM_INFO("capturing error event; look for more information in "
1889 "/sys/kernel/debug/dri/%d/i915_error_state\n",
1890 dev->primary->index);
1891
1892 kref_init(&error->ref);
1893 error->eir = I915_READ(EIR);
1894 error->pgtbl_er = I915_READ(PGTBL_ER);
1895 if (HAS_HW_CONTEXTS(dev))
1896 error->ccid = I915_READ(CCID);
1897
1898 if (HAS_PCH_SPLIT(dev))
1899 error->ier = I915_READ(DEIER) | I915_READ(GTIER);
1900 else if (IS_VALLEYVIEW(dev))
1901 error->ier = I915_READ(GTIER) | I915_READ(VLV_IER);
1902 else if (IS_GEN2(dev))
1903 error->ier = I915_READ16(IER);
1904 else
1905 error->ier = I915_READ(IER);
1906
1907 if (INTEL_INFO(dev)->gen >= 6)
1908 error->derrmr = I915_READ(DERRMR);
1909
1910 if (IS_VALLEYVIEW(dev))
1911 error->forcewake = I915_READ(FORCEWAKE_VLV);
1912 else if (INTEL_INFO(dev)->gen >= 7)
1913 error->forcewake = I915_READ(FORCEWAKE_MT);
1914 else if (INTEL_INFO(dev)->gen == 6)
1915 error->forcewake = I915_READ(FORCEWAKE);
1916
1917 if (!HAS_PCH_SPLIT(dev))
1918 for_each_pipe(pipe)
1919 error->pipestat[pipe] = I915_READ(PIPESTAT(pipe));
1920
1921 if (INTEL_INFO(dev)->gen >= 6) {
1922 error->error = I915_READ(ERROR_GEN6);
1923 error->done_reg = I915_READ(DONE_REG);
1924 }
1925
1926 if (INTEL_INFO(dev)->gen == 7)
1927 error->err_int = I915_READ(GEN7_ERR_INT);
1928
1929 i915_get_extra_instdone(dev, error->extra_instdone);
1930
1931 i915_gem_record_fences(dev, error);
1932 i915_gem_record_rings(dev, error);
1933
1934 i = 0;
1935 list_for_each_entry(obj, &dev_priv->mm.active_list, mm_list)
1936 i++;
1937 error->active_bo_count = i;
1938 list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)
1939 if (obj->pin_count)
1940 i++;
1941 error->pinned_bo_count = i - error->active_bo_count;
1942
1943 if (i) {
1944 error->active_bo = kmalloc(sizeof(*error->active_bo)*i,
1945 GFP_ATOMIC);
1946 if (error->active_bo)
1947 error->pinned_bo =
1948 error->active_bo + error->active_bo_count;
1949 }
1950
1951 if (error->active_bo)
1952 error->active_bo_count =
1953 capture_active_bo(error->active_bo,
1954 error->active_bo_count,
1955 &dev_priv->mm.active_list);
1956
1957 if (error->pinned_bo)
1958 error->pinned_bo_count =
1959 capture_pinned_bo(error->pinned_bo,
1960 error->pinned_bo_count,
1961 &dev_priv->mm.bound_list);
1962
1963 do_gettimeofday(&error->time);
1964
1965 error->overlay = intel_overlay_capture_error_state(dev);
1966 error->display = intel_display_capture_error_state(dev);
1967
1968 spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1969 if (dev_priv->gpu_error.first_error == NULL) {
1970 dev_priv->gpu_error.first_error = error;
1971 error = NULL;
1972 }
1973 spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1974
1975 if (error)
1976 i915_error_state_free(&error->ref);
1977}
1978
1979void i915_destroy_error_state(struct drm_device *dev)
1980{
1981 struct drm_i915_private *dev_priv = dev->dev_private;
1982 struct drm_i915_error_state *error;
1983 unsigned long flags;
1984
1985 spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1986 error = dev_priv->gpu_error.first_error;
1987 dev_priv->gpu_error.first_error = NULL;
1988 spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1989
1990 if (error)
1991 kref_put(&error->ref, i915_error_state_free);
1992}
1993#else
1994#define i915_capture_error_state(x)
1995#endif
1996
1997static void i915_report_and_clear_eir(struct drm_device *dev)
1998{
1999 struct drm_i915_private *dev_priv = dev->dev_private;
2000 uint32_t instdone[I915_NUM_INSTDONE_REG];
2001 u32 eir = I915_READ(EIR);
2002 int pipe, i;
2003
2004 if (!eir)
2005 return;
2006
2007 pr_err("render error detected, EIR: 0x%08x\n", eir);
2008
2009 i915_get_extra_instdone(dev, instdone);
2010
2011 if (IS_G4X(dev)) {
2012 if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
2013 u32 ipeir = I915_READ(IPEIR_I965);
2014
2015 pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
2016 pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
2017 for (i = 0; i < ARRAY_SIZE(instdone); i++)
2018 pr_err(" INSTDONE_%d: 0x%08x\n", i, instdone[i]);
2019 pr_err(" INSTPS: 0x%08x\n", I915_READ(INSTPS));
2020 pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
2021 I915_WRITE(IPEIR_I965, ipeir);
2022 POSTING_READ(IPEIR_I965);
2023 }
2024 if (eir & GM45_ERROR_PAGE_TABLE) {
2025 u32 pgtbl_err = I915_READ(PGTBL_ER);
2026 pr_err("page table error\n");
2027 pr_err(" PGTBL_ER: 0x%08x\n", pgtbl_err);
2028 I915_WRITE(PGTBL_ER, pgtbl_err);
2029 POSTING_READ(PGTBL_ER);
2030 }
2031 }
2032
2033 if (!IS_GEN2(dev)) {
2034 if (eir & I915_ERROR_PAGE_TABLE) {
2035 u32 pgtbl_err = I915_READ(PGTBL_ER);
2036 pr_err("page table error\n");
2037 pr_err(" PGTBL_ER: 0x%08x\n", pgtbl_err);
2038 I915_WRITE(PGTBL_ER, pgtbl_err);
2039 POSTING_READ(PGTBL_ER);
2040 }
2041 }
2042
2043 if (eir & I915_ERROR_MEMORY_REFRESH) {
2044 pr_err("memory refresh error:\n");
2045 for_each_pipe(pipe)
2046 pr_err("pipe %c stat: 0x%08x\n",
2047 pipe_name(pipe), I915_READ(PIPESTAT(pipe)));
2048 /* pipestat has already been acked */
2049 }
2050 if (eir & I915_ERROR_INSTRUCTION) {
2051 pr_err("instruction error\n");
2052 pr_err(" INSTPM: 0x%08x\n", I915_READ(INSTPM));
2053 for (i = 0; i < ARRAY_SIZE(instdone); i++)
2054 pr_err(" INSTDONE_%d: 0x%08x\n", i, instdone[i]);
2055 if (INTEL_INFO(dev)->gen < 4) {
2056 u32 ipeir = I915_READ(IPEIR);
2057
2058 pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR));
2059 pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR));
2060 pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD));
2061 I915_WRITE(IPEIR, ipeir);
2062 POSTING_READ(IPEIR);
2063 } else {
2064 u32 ipeir = I915_READ(IPEIR_I965);
2065
2066 pr_err(" IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
2067 pr_err(" IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
2068 pr_err(" INSTPS: 0x%08x\n", I915_READ(INSTPS));
2069 pr_err(" ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
2070 I915_WRITE(IPEIR_I965, ipeir);
2071 POSTING_READ(IPEIR_I965);
2072 }
2073 }
2074
2075 I915_WRITE(EIR, eir);
2076 POSTING_READ(EIR);
2077 eir = I915_READ(EIR);
2078 if (eir) {
2079 /*
2080 * some errors might have become stuck,
2081 * mask them.
2082 */
2083 DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
2084 I915_WRITE(EMR, I915_READ(EMR) | eir);
2085 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
2086 }
2087}
2088
2089/**
2090 * i915_handle_error - handle an error interrupt
2091 * @dev: drm device
2092 *
2093 * Do some basic checking of regsiter state at error interrupt time and
2094 * dump it to the syslog. Also call i915_capture_error_state() to make
2095 * sure we get a record and make it available in debugfs. Fire a uevent
2096 * so userspace knows something bad happened (should trigger collection
2097 * of a ring dump etc.).
2098 */
2099void i915_handle_error(struct drm_device *dev, bool wedged)
2100{
2101 struct drm_i915_private *dev_priv = dev->dev_private;
2102 struct intel_ring_buffer *ring;
2103 int i;
2104
2105 i915_capture_error_state(dev);
2106 i915_report_and_clear_eir(dev);
2107
2108 if (wedged) {
2109 atomic_set_mask(I915_RESET_IN_PROGRESS_FLAG,
2110 &dev_priv->gpu_error.reset_counter);
2111
2112 /*
2113 * Wakeup waiting processes so that the reset work item
2114 * doesn't deadlock trying to grab various locks.
2115 */
2116 for_each_ring(ring, dev_priv, i)
2117 wake_up_all(&ring->irq_queue);
2118 }
2119
2120 queue_work(dev_priv->wq, &dev_priv->gpu_error.work);
2121}
2122
2123static void __always_unused i915_pageflip_stall_check(struct drm_device *dev, int pipe)
2124{
2125 drm_i915_private_t *dev_priv = dev->dev_private;
2126 struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[pipe];
2127 struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
2128 struct drm_i915_gem_object *obj;
2129 struct intel_unpin_work *work;
2130 unsigned long flags;
2131 bool stall_detected;
2132
2133 /* Ignore early vblank irqs */
2134 if (intel_crtc == NULL)
2135 return;
2136
2137 spin_lock_irqsave(&dev->event_lock, flags);
2138 work = intel_crtc->unpin_work;
2139
2140 if (work == NULL ||
2141 atomic_read(&work->pending) >= INTEL_FLIP_COMPLETE ||
2142 !work->enable_stall_check) {
2143 /* Either the pending flip IRQ arrived, or we're too early. Don't check */
2144 spin_unlock_irqrestore(&dev->event_lock, flags);
2145 return;
2146 }
2147
2148 /* Potential stall - if we see that the flip has happened, assume a missed interrupt */
2149 obj = work->pending_flip_obj;
2150 if (INTEL_INFO(dev)->gen >= 4) {
2151 int dspsurf = DSPSURF(intel_crtc->plane);
2152 stall_detected = I915_HI_DISPBASE(I915_READ(dspsurf)) ==
2153 obj->gtt_offset;
2154 } else {
2155 int dspaddr = DSPADDR(intel_crtc->plane);
2156 stall_detected = I915_READ(dspaddr) == (obj->gtt_offset +
2157 crtc->y * crtc->fb->pitches[0] +
2158 crtc->x * crtc->fb->bits_per_pixel/8);
2159 }
2160
2161 spin_unlock_irqrestore(&dev->event_lock, flags);
2162
2163 if (stall_detected) {
2164 DRM_DEBUG_DRIVER("Pageflip stall detected\n");
2165 intel_prepare_page_flip(dev, intel_crtc->plane);
2166 }
2167}
2168
2169/* Called from drm generic code, passed 'crtc' which
2170 * we use as a pipe index
2171 */
2172static int i915_enable_vblank(struct drm_device *dev, int pipe)
2173{
2174 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2175 unsigned long irqflags;
2176
2177 if (!i915_pipe_enabled(dev, pipe))
2178 return -EINVAL;
2179
2180 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2181 if (INTEL_INFO(dev)->gen >= 4)
2182 i915_enable_pipestat(dev_priv, pipe,
2183 PIPE_START_VBLANK_INTERRUPT_ENABLE);
2184 else
2185 i915_enable_pipestat(dev_priv, pipe,
2186 PIPE_VBLANK_INTERRUPT_ENABLE);
2187
2188 /* maintain vblank delivery even in deep C-states */
2189 if (dev_priv->info->gen == 3)
2190 I915_WRITE(INSTPM, _MASKED_BIT_DISABLE(INSTPM_AGPBUSY_DIS));
2191 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2192
2193 return 0;
2194}
2195
2196static int ironlake_enable_vblank(struct drm_device *dev, int pipe)
2197{
2198 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2199 unsigned long irqflags;
2200
2201 if (!i915_pipe_enabled(dev, pipe))
2202 return -EINVAL;
2203
2204 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2205 ironlake_enable_display_irq(dev_priv, (pipe == 0) ?
2206 DE_PIPEA_VBLANK : DE_PIPEB_VBLANK);
2207 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2208
2209 return 0;
2210}
2211
2212static int ivybridge_enable_vblank(struct drm_device *dev, int pipe)
2213{
2214 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2215 unsigned long irqflags;
2216
2217 if (!i915_pipe_enabled(dev, pipe))
2218 return -EINVAL;
2219
2220 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2221 ironlake_enable_display_irq(dev_priv,
2222 DE_PIPEA_VBLANK_IVB << (5 * pipe));
2223 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2224
2225 return 0;
2226}
2227
2228static int valleyview_enable_vblank(struct drm_device *dev, int pipe)
2229{
2230 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2231 unsigned long irqflags;
2232 u32 imr;
2233
2234 if (!i915_pipe_enabled(dev, pipe))
2235 return -EINVAL;
2236
2237 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2238 imr = I915_READ(VLV_IMR);
2239 if (pipe == 0)
2240 imr &= ~I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
2241 else
2242 imr &= ~I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2243 I915_WRITE(VLV_IMR, imr);
2244 i915_enable_pipestat(dev_priv, pipe,
2245 PIPE_START_VBLANK_INTERRUPT_ENABLE);
2246 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2247
2248 return 0;
2249}
2250
2251/* Called from drm generic code, passed 'crtc' which
2252 * we use as a pipe index
2253 */
2254static void i915_disable_vblank(struct drm_device *dev, int pipe)
2255{
2256 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2257 unsigned long irqflags;
2258
2259 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2260 if (dev_priv->info->gen == 3)
2261 I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_AGPBUSY_DIS));
2262
2263 i915_disable_pipestat(dev_priv, pipe,
2264 PIPE_VBLANK_INTERRUPT_ENABLE |
2265 PIPE_START_VBLANK_INTERRUPT_ENABLE);
2266 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2267}
2268
2269static void ironlake_disable_vblank(struct drm_device *dev, int pipe)
2270{
2271 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2272 unsigned long irqflags;
2273
2274 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2275 ironlake_disable_display_irq(dev_priv, (pipe == 0) ?
2276 DE_PIPEA_VBLANK : DE_PIPEB_VBLANK);
2277 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2278}
2279
2280static void ivybridge_disable_vblank(struct drm_device *dev, int pipe)
2281{
2282 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2283 unsigned long irqflags;
2284
2285 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2286 ironlake_disable_display_irq(dev_priv,
2287 DE_PIPEA_VBLANK_IVB << (pipe * 5));
2288 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2289}
2290
2291static void valleyview_disable_vblank(struct drm_device *dev, int pipe)
2292{
2293 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2294 unsigned long irqflags;
2295 u32 imr;
2296
2297 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2298 i915_disable_pipestat(dev_priv, pipe,
2299 PIPE_START_VBLANK_INTERRUPT_ENABLE);
2300 imr = I915_READ(VLV_IMR);
2301 if (pipe == 0)
2302 imr |= I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT;
2303 else
2304 imr |= I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2305 I915_WRITE(VLV_IMR, imr);
2306 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2307}
2308
2309static u32
2310ring_last_seqno(struct intel_ring_buffer *ring)
2311{
2312 return list_entry(ring->request_list.prev,
2313 struct drm_i915_gem_request, list)->seqno;
2314}
2315
2316static bool
2317ring_idle(struct intel_ring_buffer *ring, u32 seqno)
2318{
2319 return (list_empty(&ring->request_list) ||
2320 i915_seqno_passed(seqno, ring_last_seqno(ring)));
2321}
2322
2323static struct intel_ring_buffer *
2324semaphore_waits_for(struct intel_ring_buffer *ring, u32 *seqno)
2325{
2326 struct drm_i915_private *dev_priv = ring->dev->dev_private;
2327 u32 cmd, ipehr, acthd, acthd_min;
2328
2329 ipehr = I915_READ(RING_IPEHR(ring->mmio_base));
2330 if ((ipehr & ~(0x3 << 16)) !=
2331 (MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | MI_SEMAPHORE_REGISTER))
2332 return NULL;
2333
2334 /* ACTHD is likely pointing to the dword after the actual command,
2335 * so scan backwards until we find the MBOX.
2336 */
2337 acthd = intel_ring_get_active_head(ring) & HEAD_ADDR;
2338 acthd_min = max((int)acthd - 3 * 4, 0);
2339 do {
2340 cmd = ioread32(ring->virtual_start + acthd);
2341 if (cmd == ipehr)
2342 break;
2343
2344 acthd -= 4;
2345 if (acthd < acthd_min)
2346 return NULL;
2347 } while (1);
2348
2349 *seqno = ioread32(ring->virtual_start+acthd+4)+1;
2350 return &dev_priv->ring[(ring->id + (((ipehr >> 17) & 1) + 1)) % 3];
2351}
2352
2353static int semaphore_passed(struct intel_ring_buffer *ring)
2354{
2355 struct drm_i915_private *dev_priv = ring->dev->dev_private;
2356 struct intel_ring_buffer *signaller;
2357 u32 seqno, ctl;
2358
2359 ring->hangcheck.deadlock = true;
2360
2361 signaller = semaphore_waits_for(ring, &seqno);
2362 if (signaller == NULL || signaller->hangcheck.deadlock)
2363 return -1;
2364
2365 /* cursory check for an unkickable deadlock */
2366 ctl = I915_READ_CTL(signaller);
2367 if (ctl & RING_WAIT_SEMAPHORE && semaphore_passed(signaller) < 0)
2368 return -1;
2369
2370 return i915_seqno_passed(signaller->get_seqno(signaller, false), seqno);
2371}
2372
2373static void semaphore_clear_deadlocks(struct drm_i915_private *dev_priv)
2374{
2375 struct intel_ring_buffer *ring;
2376 int i;
2377
2378 for_each_ring(ring, dev_priv, i)
2379 ring->hangcheck.deadlock = false;
2380}
2381
2382static enum intel_ring_hangcheck_action
2383ring_stuck(struct intel_ring_buffer *ring, u32 acthd)
2384{
2385 struct drm_device *dev = ring->dev;
2386 struct drm_i915_private *dev_priv = dev->dev_private;
2387 u32 tmp;
2388
2389 if (ring->hangcheck.acthd != acthd)
2390 return active;
2391
2392 if (IS_GEN2(dev))
2393 return hung;
2394
2395 /* Is the chip hanging on a WAIT_FOR_EVENT?
2396 * If so we can simply poke the RB_WAIT bit
2397 * and break the hang. This should work on
2398 * all but the second generation chipsets.
2399 */
2400 tmp = I915_READ_CTL(ring);
2401 if (tmp & RING_WAIT) {
2402 DRM_ERROR("Kicking stuck wait on %s\n",
2403 ring->name);
2404 I915_WRITE_CTL(ring, tmp);
2405 return kick;
2406 }
2407
2408 if (INTEL_INFO(dev)->gen >= 6 && tmp & RING_WAIT_SEMAPHORE) {
2409 switch (semaphore_passed(ring)) {
2410 default:
2411 return hung;
2412 case 1:
2413 DRM_ERROR("Kicking stuck semaphore on %s\n",
2414 ring->name);
2415 I915_WRITE_CTL(ring, tmp);
2416 return kick;
2417 case 0:
2418 return wait;
2419 }
2420 }
2421
2422 return hung;
2423}
2424
2425/**
2426 * This is called when the chip hasn't reported back with completed
2427 * batchbuffers in a long time. We keep track per ring seqno progress and
2428 * if there are no progress, hangcheck score for that ring is increased.
2429 * Further, acthd is inspected to see if the ring is stuck. On stuck case
2430 * we kick the ring. If we see no progress on three subsequent calls
2431 * we assume chip is wedged and try to fix it by resetting the chip.
2432 */
2433void i915_hangcheck_elapsed(unsigned long data)
2434{
2435 struct drm_device *dev = (struct drm_device *)data;
2436 drm_i915_private_t *dev_priv = dev->dev_private;
2437 struct intel_ring_buffer *ring;
2438 int i;
2439 int busy_count = 0, rings_hung = 0;
2440 bool stuck[I915_NUM_RINGS] = { 0 };
2441#define BUSY 1
2442#define KICK 5
2443#define HUNG 20
2444#define FIRE 30
2445
2446 if (!i915_enable_hangcheck)
2447 return;
2448
2449 for_each_ring(ring, dev_priv, i) {
2450 u32 seqno, acthd;
2451 bool busy = true;
2452
2453 semaphore_clear_deadlocks(dev_priv);
2454
2455 seqno = ring->get_seqno(ring, false);
2456 acthd = intel_ring_get_active_head(ring);
2457
2458 if (ring->hangcheck.seqno == seqno) {
2459 if (ring_idle(ring, seqno)) {
2460 if (waitqueue_active(&ring->irq_queue)) {
2461 /* Issue a wake-up to catch stuck h/w. */
2462 DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
2463 ring->name);
2464 wake_up_all(&ring->irq_queue);
2465 ring->hangcheck.score += HUNG;
2466 } else
2467 busy = false;
2468 } else {
2469 int score;
2470
2471 /* We always increment the hangcheck score
2472 * if the ring is busy and still processing
2473 * the same request, so that no single request
2474 * can run indefinitely (such as a chain of
2475 * batches). The only time we do not increment
2476 * the hangcheck score on this ring, if this
2477 * ring is in a legitimate wait for another
2478 * ring. In that case the waiting ring is a
2479 * victim and we want to be sure we catch the
2480 * right culprit. Then every time we do kick
2481 * the ring, add a small increment to the
2482 * score so that we can catch a batch that is
2483 * being repeatedly kicked and so responsible
2484 * for stalling the machine.
2485 */
2486 ring->hangcheck.action = ring_stuck(ring,
2487 acthd);
2488
2489 switch (ring->hangcheck.action) {
2490 case wait:
2491 score = 0;
2492 break;
2493 case active:
2494 score = BUSY;
2495 break;
2496 case kick:
2497 score = KICK;
2498 break;
2499 case hung:
2500 score = HUNG;
2501 stuck[i] = true;
2502 break;
2503 }
2504 ring->hangcheck.score += score;
2505 }
2506 } else {
2507 /* Gradually reduce the count so that we catch DoS
2508 * attempts across multiple batches.
2509 */
2510 if (ring->hangcheck.score > 0)
2511 ring->hangcheck.score--;
2512 }
2513
2514 ring->hangcheck.seqno = seqno;
2515 ring->hangcheck.acthd = acthd;
2516 busy_count += busy;
2517 }
2518
2519 for_each_ring(ring, dev_priv, i) {
2520 if (ring->hangcheck.score > FIRE) {
2521 DRM_ERROR("%s on %s\n",
2522 stuck[i] ? "stuck" : "no progress",
2523 ring->name);
2524 rings_hung++;
2525 }
2526 }
2527
2528 if (rings_hung)
2529 return i915_handle_error(dev, true);
2530
2531 if (busy_count)
2532 /* Reset timer case chip hangs without another request
2533 * being added */
2534 mod_timer(&dev_priv->gpu_error.hangcheck_timer,
2535 round_jiffies_up(jiffies +
2536 DRM_I915_HANGCHECK_JIFFIES));
2537}
2538
2539static void ibx_irq_preinstall(struct drm_device *dev)
2540{
2541 struct drm_i915_private *dev_priv = dev->dev_private;
2542
2543 if (HAS_PCH_NOP(dev))
2544 return;
2545
2546 /* south display irq */
2547 I915_WRITE(SDEIMR, 0xffffffff);
2548 /*
2549 * SDEIER is also touched by the interrupt handler to work around missed
2550 * PCH interrupts. Hence we can't update it after the interrupt handler
2551 * is enabled - instead we unconditionally enable all PCH interrupt
2552 * sources here, but then only unmask them as needed with SDEIMR.
2553 */
2554 I915_WRITE(SDEIER, 0xffffffff);
2555 POSTING_READ(SDEIER);
2556}
2557
2558/* drm_dma.h hooks
2559*/
2560static void ironlake_irq_preinstall(struct drm_device *dev)
2561{
2562 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2563
2564 atomic_set(&dev_priv->irq_received, 0);
2565
2566 I915_WRITE(HWSTAM, 0xeffe);
2567
2568 /* XXX hotplug from PCH */
2569
2570 I915_WRITE(DEIMR, 0xffffffff);
2571 I915_WRITE(DEIER, 0x0);
2572 POSTING_READ(DEIER);
2573
2574 /* and GT */
2575 I915_WRITE(GTIMR, 0xffffffff);
2576 I915_WRITE(GTIER, 0x0);
2577 POSTING_READ(GTIER);
2578
2579 ibx_irq_preinstall(dev);
2580}
2581
2582static void ivybridge_irq_preinstall(struct drm_device *dev)
2583{
2584 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2585
2586 atomic_set(&dev_priv->irq_received, 0);
2587
2588 I915_WRITE(HWSTAM, 0xeffe);
2589
2590 /* XXX hotplug from PCH */
2591
2592 I915_WRITE(DEIMR, 0xffffffff);
2593 I915_WRITE(DEIER, 0x0);
2594 POSTING_READ(DEIER);
2595
2596 /* and GT */
2597 I915_WRITE(GTIMR, 0xffffffff);
2598 I915_WRITE(GTIER, 0x0);
2599 POSTING_READ(GTIER);
2600
2601 /* Power management */
2602 I915_WRITE(GEN6_PMIMR, 0xffffffff);
2603 I915_WRITE(GEN6_PMIER, 0x0);
2604 POSTING_READ(GEN6_PMIER);
2605
2606 ibx_irq_preinstall(dev);
2607}
2608
2609static void valleyview_irq_preinstall(struct drm_device *dev)
2610{
2611 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2612 int pipe;
2613
2614 atomic_set(&dev_priv->irq_received, 0);
2615
2616 /* VLV magic */
2617 I915_WRITE(VLV_IMR, 0);
2618 I915_WRITE(RING_IMR(RENDER_RING_BASE), 0);
2619 I915_WRITE(RING_IMR(GEN6_BSD_RING_BASE), 0);
2620 I915_WRITE(RING_IMR(BLT_RING_BASE), 0);
2621
2622 /* and GT */
2623 I915_WRITE(GTIIR, I915_READ(GTIIR));
2624 I915_WRITE(GTIIR, I915_READ(GTIIR));
2625 I915_WRITE(GTIMR, 0xffffffff);
2626 I915_WRITE(GTIER, 0x0);
2627 POSTING_READ(GTIER);
2628
2629 I915_WRITE(DPINVGTT, 0xff);
2630
2631 I915_WRITE(PORT_HOTPLUG_EN, 0);
2632 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
2633 for_each_pipe(pipe)
2634 I915_WRITE(PIPESTAT(pipe), 0xffff);
2635 I915_WRITE(VLV_IIR, 0xffffffff);
2636 I915_WRITE(VLV_IMR, 0xffffffff);
2637 I915_WRITE(VLV_IER, 0x0);
2638 POSTING_READ(VLV_IER);
2639}
2640
2641static void ibx_hpd_irq_setup(struct drm_device *dev)
2642{
2643 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2644 struct drm_mode_config *mode_config = &dev->mode_config;
2645 struct intel_encoder *intel_encoder;
2646 u32 mask = ~I915_READ(SDEIMR);
2647 u32 hotplug;
2648
2649 if (HAS_PCH_IBX(dev)) {
2650 mask &= ~SDE_HOTPLUG_MASK;
2651 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
2652 if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
2653 mask |= hpd_ibx[intel_encoder->hpd_pin];
2654 } else {
2655 mask &= ~SDE_HOTPLUG_MASK_CPT;
2656 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
2657 if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
2658 mask |= hpd_cpt[intel_encoder->hpd_pin];
2659 }
2660
2661 I915_WRITE(SDEIMR, ~mask);
2662
2663 /*
2664 * Enable digital hotplug on the PCH, and configure the DP short pulse
2665 * duration to 2ms (which is the minimum in the Display Port spec)
2666 *
2667 * This register is the same on all known PCH chips.
2668 */
2669 hotplug = I915_READ(PCH_PORT_HOTPLUG);
2670 hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK);
2671 hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;
2672 hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;
2673 hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;
2674 I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
2675}
2676
2677static void ibx_irq_postinstall(struct drm_device *dev)
2678{
2679 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2680 u32 mask;
2681
2682 if (HAS_PCH_NOP(dev))
2683 return;
2684
2685 if (HAS_PCH_IBX(dev)) {
2686 mask = SDE_GMBUS | SDE_AUX_MASK | SDE_TRANSB_FIFO_UNDER |
2687 SDE_TRANSA_FIFO_UNDER | SDE_POISON;
2688 } else {
2689 mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
2690
2691 I915_WRITE(SERR_INT, I915_READ(SERR_INT));
2692 }
2693
2694 I915_WRITE(SDEIIR, I915_READ(SDEIIR));
2695 I915_WRITE(SDEIMR, ~mask);
2696}
2697
2698static int ironlake_irq_postinstall(struct drm_device *dev)
2699{
2700 unsigned long irqflags;
2701
2702 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2703 /* enable kind of interrupts always enabled */
2704 u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
2705 DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE |
2706 DE_AUX_CHANNEL_A | DE_PIPEB_FIFO_UNDERRUN |
2707 DE_PIPEA_FIFO_UNDERRUN | DE_POISON;
2708 u32 gt_irqs;
2709
2710 dev_priv->irq_mask = ~display_mask;
2711
2712 /* should always can generate irq */
2713 I915_WRITE(DEIIR, I915_READ(DEIIR));
2714 I915_WRITE(DEIMR, dev_priv->irq_mask);
2715 I915_WRITE(DEIER, display_mask |
2716 DE_PIPEA_VBLANK | DE_PIPEB_VBLANK | DE_PCU_EVENT);
2717 POSTING_READ(DEIER);
2718
2719 dev_priv->gt_irq_mask = ~0;
2720
2721 I915_WRITE(GTIIR, I915_READ(GTIIR));
2722 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
2723
2724 gt_irqs = GT_RENDER_USER_INTERRUPT;
2725
2726 if (IS_GEN6(dev))
2727 gt_irqs |= GT_BLT_USER_INTERRUPT | GT_BSD_USER_INTERRUPT;
2728 else
2729 gt_irqs |= GT_RENDER_PIPECTL_NOTIFY_INTERRUPT |
2730 ILK_BSD_USER_INTERRUPT;
2731
2732 I915_WRITE(GTIER, gt_irqs);
2733 POSTING_READ(GTIER);
2734
2735 ibx_irq_postinstall(dev);
2736
2737 if (IS_IRONLAKE_M(dev)) {
2738 /* Enable PCU event interrupts
2739 *
2740 * spinlocking not required here for correctness since interrupt
2741 * setup is guaranteed to run in single-threaded context. But we
2742 * need it to make the assert_spin_locked happy. */
2743 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
2744 ironlake_enable_display_irq(dev_priv, DE_PCU_EVENT);
2745 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
2746 }
2747
2748 return 0;
2749}
2750
2751static int ivybridge_irq_postinstall(struct drm_device *dev)
2752{
2753 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2754 /* enable kind of interrupts always enabled */
2755 u32 display_mask =
2756 DE_MASTER_IRQ_CONTROL | DE_GSE_IVB | DE_PCH_EVENT_IVB |
2757 DE_PLANEC_FLIP_DONE_IVB |
2758 DE_PLANEB_FLIP_DONE_IVB |
2759 DE_PLANEA_FLIP_DONE_IVB |
2760 DE_AUX_CHANNEL_A_IVB |
2761 DE_ERR_INT_IVB;
2762 u32 pm_irqs = GEN6_PM_RPS_EVENTS;
2763 u32 gt_irqs;
2764
2765 dev_priv->irq_mask = ~display_mask;
2766
2767 /* should always can generate irq */
2768 I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
2769 I915_WRITE(DEIIR, I915_READ(DEIIR));
2770 I915_WRITE(DEIMR, dev_priv->irq_mask);
2771 I915_WRITE(DEIER,
2772 display_mask |
2773 DE_PIPEC_VBLANK_IVB |
2774 DE_PIPEB_VBLANK_IVB |
2775 DE_PIPEA_VBLANK_IVB);
2776 POSTING_READ(DEIER);
2777
2778 dev_priv->gt_irq_mask = ~GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
2779
2780 I915_WRITE(GTIIR, I915_READ(GTIIR));
2781 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
2782
2783 gt_irqs = GT_RENDER_USER_INTERRUPT | GT_BSD_USER_INTERRUPT |
2784 GT_BLT_USER_INTERRUPT | GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
2785 I915_WRITE(GTIER, gt_irqs);
2786 POSTING_READ(GTIER);
2787
2788 I915_WRITE(GEN6_PMIIR, I915_READ(GEN6_PMIIR));
2789 if (HAS_VEBOX(dev))
2790 pm_irqs |= PM_VEBOX_USER_INTERRUPT |
2791 PM_VEBOX_CS_ERROR_INTERRUPT;
2792
2793 /* Our enable/disable rps functions may touch these registers so
2794 * make sure to set a known state for only the non-RPS bits.
2795 * The RMW is extra paranoia since this should be called after being set
2796 * to a known state in preinstall.
2797 * */
2798 I915_WRITE(GEN6_PMIMR,
2799 (I915_READ(GEN6_PMIMR) | ~GEN6_PM_RPS_EVENTS) & ~pm_irqs);
2800 I915_WRITE(GEN6_PMIER,
2801 (I915_READ(GEN6_PMIER) & GEN6_PM_RPS_EVENTS) | pm_irqs);
2802 POSTING_READ(GEN6_PMIER);
2803
2804 ibx_irq_postinstall(dev);
2805
2806 return 0;
2807}
2808
2809static int valleyview_irq_postinstall(struct drm_device *dev)
2810{
2811 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2812 u32 gt_irqs;
2813 u32 enable_mask;
2814 u32 pipestat_enable = PLANE_FLIP_DONE_INT_EN_VLV;
2815
2816 enable_mask = I915_DISPLAY_PORT_INTERRUPT;
2817 enable_mask |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
2818 I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
2819 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
2820 I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2821
2822 /*
2823 *Leave vblank interrupts masked initially. enable/disable will
2824 * toggle them based on usage.
2825 */
2826 dev_priv->irq_mask = (~enable_mask) |
2827 I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
2828 I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT;
2829
2830 I915_WRITE(PORT_HOTPLUG_EN, 0);
2831 POSTING_READ(PORT_HOTPLUG_EN);
2832
2833 I915_WRITE(VLV_IMR, dev_priv->irq_mask);
2834 I915_WRITE(VLV_IER, enable_mask);
2835 I915_WRITE(VLV_IIR, 0xffffffff);
2836 I915_WRITE(PIPESTAT(0), 0xffff);
2837 I915_WRITE(PIPESTAT(1), 0xffff);
2838 POSTING_READ(VLV_IER);
2839
2840 i915_enable_pipestat(dev_priv, 0, pipestat_enable);
2841 i915_enable_pipestat(dev_priv, 0, PIPE_GMBUS_EVENT_ENABLE);
2842 i915_enable_pipestat(dev_priv, 1, pipestat_enable);
2843
2844 I915_WRITE(VLV_IIR, 0xffffffff);
2845 I915_WRITE(VLV_IIR, 0xffffffff);
2846
2847 I915_WRITE(GTIIR, I915_READ(GTIIR));
2848 I915_WRITE(GTIMR, dev_priv->gt_irq_mask);
2849
2850 gt_irqs = GT_RENDER_USER_INTERRUPT | GT_BSD_USER_INTERRUPT |
2851 GT_BLT_USER_INTERRUPT;
2852 I915_WRITE(GTIER, gt_irqs);
2853 POSTING_READ(GTIER);
2854
2855 /* ack & enable invalid PTE error interrupts */
2856#if 0 /* FIXME: add support to irq handler for checking these bits */
2857 I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK);
2858 I915_WRITE(DPINVGTT, DPINVGTT_EN_MASK);
2859#endif
2860
2861 I915_WRITE(VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);
2862
2863 return 0;
2864}
2865
2866static void valleyview_irq_uninstall(struct drm_device *dev)
2867{
2868 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2869 int pipe;
2870
2871 if (!dev_priv)
2872 return;
2873
2874 del_timer_sync(&dev_priv->hotplug_reenable_timer);
2875
2876 for_each_pipe(pipe)
2877 I915_WRITE(PIPESTAT(pipe), 0xffff);
2878
2879 I915_WRITE(HWSTAM, 0xffffffff);
2880 I915_WRITE(PORT_HOTPLUG_EN, 0);
2881 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
2882 for_each_pipe(pipe)
2883 I915_WRITE(PIPESTAT(pipe), 0xffff);
2884 I915_WRITE(VLV_IIR, 0xffffffff);
2885 I915_WRITE(VLV_IMR, 0xffffffff);
2886 I915_WRITE(VLV_IER, 0x0);
2887 POSTING_READ(VLV_IER);
2888}
2889
2890static void ironlake_irq_uninstall(struct drm_device *dev)
2891{
2892 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2893
2894 if (!dev_priv)
2895 return;
2896
2897 del_timer_sync(&dev_priv->hotplug_reenable_timer);
2898
2899 I915_WRITE(HWSTAM, 0xffffffff);
2900
2901 I915_WRITE(DEIMR, 0xffffffff);
2902 I915_WRITE(DEIER, 0x0);
2903 I915_WRITE(DEIIR, I915_READ(DEIIR));
2904 if (IS_GEN7(dev))
2905 I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
2906
2907 I915_WRITE(GTIMR, 0xffffffff);
2908 I915_WRITE(GTIER, 0x0);
2909 I915_WRITE(GTIIR, I915_READ(GTIIR));
2910
2911 if (HAS_PCH_NOP(dev))
2912 return;
2913
2914 I915_WRITE(SDEIMR, 0xffffffff);
2915 I915_WRITE(SDEIER, 0x0);
2916 I915_WRITE(SDEIIR, I915_READ(SDEIIR));
2917 if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev))
2918 I915_WRITE(SERR_INT, I915_READ(SERR_INT));
2919}
2920
2921static void i8xx_irq_preinstall(struct drm_device * dev)
2922{
2923 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2924 int pipe;
2925
2926 atomic_set(&dev_priv->irq_received, 0);
2927
2928 for_each_pipe(pipe)
2929 I915_WRITE(PIPESTAT(pipe), 0);
2930 I915_WRITE16(IMR, 0xffff);
2931 I915_WRITE16(IER, 0x0);
2932 POSTING_READ16(IER);
2933}
2934
2935static int i8xx_irq_postinstall(struct drm_device *dev)
2936{
2937 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2938
2939 I915_WRITE16(EMR,
2940 ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH));
2941
2942 /* Unmask the interrupts that we always want on. */
2943 dev_priv->irq_mask =
2944 ~(I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
2945 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
2946 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
2947 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
2948 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
2949 I915_WRITE16(IMR, dev_priv->irq_mask);
2950
2951 I915_WRITE16(IER,
2952 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
2953 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
2954 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT |
2955 I915_USER_INTERRUPT);
2956 POSTING_READ16(IER);
2957
2958 return 0;
2959}
2960
2961/*
2962 * Returns true when a page flip has completed.
2963 */
2964static bool i8xx_handle_vblank(struct drm_device *dev,
2965 int pipe, u16 iir)
2966{
2967 drm_i915_private_t *dev_priv = dev->dev_private;
2968 u16 flip_pending = DISPLAY_PLANE_FLIP_PENDING(pipe);
2969
2970 if (!drm_handle_vblank(dev, pipe))
2971 return false;
2972
2973 if ((iir & flip_pending) == 0)
2974 return false;
2975
2976 intel_prepare_page_flip(dev, pipe);
2977
2978 /* We detect FlipDone by looking for the change in PendingFlip from '1'
2979 * to '0' on the following vblank, i.e. IIR has the Pendingflip
2980 * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
2981 * the flip is completed (no longer pending). Since this doesn't raise
2982 * an interrupt per se, we watch for the change at vblank.
2983 */
2984 if (I915_READ16(ISR) & flip_pending)
2985 return false;
2986
2987 intel_finish_page_flip(dev, pipe);
2988
2989 return true;
2990}
2991
2992static irqreturn_t i8xx_irq_handler(int irq, void *arg)
2993{
2994 struct drm_device *dev = (struct drm_device *) arg;
2995 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
2996 u16 iir, new_iir;
2997 u32 pipe_stats[2];
2998 unsigned long irqflags;
2999 int irq_received;
3000 int pipe;
3001 u16 flip_mask =
3002 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3003 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3004
3005 atomic_inc(&dev_priv->irq_received);
3006
3007 iir = I915_READ16(IIR);
3008 if (iir == 0)
3009 return IRQ_NONE;
3010
3011 while (iir & ~flip_mask) {
3012 /* Can't rely on pipestat interrupt bit in iir as it might
3013 * have been cleared after the pipestat interrupt was received.
3014 * It doesn't set the bit in iir again, but it still produces
3015 * interrupts (for non-MSI).
3016 */
3017 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3018 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3019 i915_handle_error(dev, false);
3020
3021 for_each_pipe(pipe) {
3022 int reg = PIPESTAT(pipe);
3023 pipe_stats[pipe] = I915_READ(reg);
3024
3025 /*
3026 * Clear the PIPE*STAT regs before the IIR
3027 */
3028 if (pipe_stats[pipe] & 0x8000ffff) {
3029 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
3030 DRM_DEBUG_DRIVER("pipe %c underrun\n",
3031 pipe_name(pipe));
3032 I915_WRITE(reg, pipe_stats[pipe]);
3033 irq_received = 1;
3034 }
3035 }
3036 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3037
3038 I915_WRITE16(IIR, iir & ~flip_mask);
3039 new_iir = I915_READ16(IIR); /* Flush posted writes */
3040
3041 i915_update_dri1_breadcrumb(dev);
3042
3043 if (iir & I915_USER_INTERRUPT)
3044 notify_ring(dev, &dev_priv->ring[RCS]);
3045
3046 if (pipe_stats[0] & PIPE_VBLANK_INTERRUPT_STATUS &&
3047 i8xx_handle_vblank(dev, 0, iir))
3048 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(0);
3049
3050 if (pipe_stats[1] & PIPE_VBLANK_INTERRUPT_STATUS &&
3051 i8xx_handle_vblank(dev, 1, iir))
3052 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(1);
3053
3054 iir = new_iir;
3055 }
3056
3057 return IRQ_HANDLED;
3058}
3059
3060static void i8xx_irq_uninstall(struct drm_device * dev)
3061{
3062 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3063 int pipe;
3064
3065 for_each_pipe(pipe) {
3066 /* Clear enable bits; then clear status bits */
3067 I915_WRITE(PIPESTAT(pipe), 0);
3068 I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe)));
3069 }
3070 I915_WRITE16(IMR, 0xffff);
3071 I915_WRITE16(IER, 0x0);
3072 I915_WRITE16(IIR, I915_READ16(IIR));
3073}
3074
3075static void i915_irq_preinstall(struct drm_device * dev)
3076{
3077 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3078 int pipe;
3079
3080 atomic_set(&dev_priv->irq_received, 0);
3081
3082 if (I915_HAS_HOTPLUG(dev)) {
3083 I915_WRITE(PORT_HOTPLUG_EN, 0);
3084 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3085 }
3086
3087 I915_WRITE16(HWSTAM, 0xeffe);
3088 for_each_pipe(pipe)
3089 I915_WRITE(PIPESTAT(pipe), 0);
3090 I915_WRITE(IMR, 0xffffffff);
3091 I915_WRITE(IER, 0x0);
3092 POSTING_READ(IER);
3093}
3094
3095static int i915_irq_postinstall(struct drm_device *dev)
3096{
3097 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3098 u32 enable_mask;
3099
3100 I915_WRITE(EMR, ~(I915_ERROR_PAGE_TABLE | I915_ERROR_MEMORY_REFRESH));
3101
3102 /* Unmask the interrupts that we always want on. */
3103 dev_priv->irq_mask =
3104 ~(I915_ASLE_INTERRUPT |
3105 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3106 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3107 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3108 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3109 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3110
3111 enable_mask =
3112 I915_ASLE_INTERRUPT |
3113 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3114 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3115 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT |
3116 I915_USER_INTERRUPT;
3117
3118 if (I915_HAS_HOTPLUG(dev)) {
3119 I915_WRITE(PORT_HOTPLUG_EN, 0);
3120 POSTING_READ(PORT_HOTPLUG_EN);
3121
3122 /* Enable in IER... */
3123 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
3124 /* and unmask in IMR */
3125 dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT;
3126 }
3127
3128 I915_WRITE(IMR, dev_priv->irq_mask);
3129 I915_WRITE(IER, enable_mask);
3130 POSTING_READ(IER);
3131
3132 i915_enable_asle_pipestat(dev);
3133
3134 return 0;
3135}
3136
3137/*
3138 * Returns true when a page flip has completed.
3139 */
3140static bool i915_handle_vblank(struct drm_device *dev,
3141 int plane, int pipe, u32 iir)
3142{
3143 drm_i915_private_t *dev_priv = dev->dev_private;
3144 u32 flip_pending = DISPLAY_PLANE_FLIP_PENDING(plane);
3145
3146 if (!drm_handle_vblank(dev, pipe))
3147 return false;
3148
3149 if ((iir & flip_pending) == 0)
3150 return false;
3151
3152 intel_prepare_page_flip(dev, plane);
3153
3154 /* We detect FlipDone by looking for the change in PendingFlip from '1'
3155 * to '0' on the following vblank, i.e. IIR has the Pendingflip
3156 * asserted following the MI_DISPLAY_FLIP, but ISR is deasserted, hence
3157 * the flip is completed (no longer pending). Since this doesn't raise
3158 * an interrupt per se, we watch for the change at vblank.
3159 */
3160 if (I915_READ(ISR) & flip_pending)
3161 return false;
3162
3163 intel_finish_page_flip(dev, pipe);
3164
3165 return true;
3166}
3167
3168static irqreturn_t i915_irq_handler(int irq, void *arg)
3169{
3170 struct drm_device *dev = (struct drm_device *) arg;
3171 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3172 u32 iir, new_iir, pipe_stats[I915_MAX_PIPES];
3173 unsigned long irqflags;
3174 u32 flip_mask =
3175 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3176 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3177 int pipe, ret = IRQ_NONE;
3178
3179 atomic_inc(&dev_priv->irq_received);
3180
3181 iir = I915_READ(IIR);
3182 do {
3183 bool irq_received = (iir & ~flip_mask) != 0;
3184 bool blc_event = false;
3185
3186 /* Can't rely on pipestat interrupt bit in iir as it might
3187 * have been cleared after the pipestat interrupt was received.
3188 * It doesn't set the bit in iir again, but it still produces
3189 * interrupts (for non-MSI).
3190 */
3191 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3192 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3193 i915_handle_error(dev, false);
3194
3195 for_each_pipe(pipe) {
3196 int reg = PIPESTAT(pipe);
3197 pipe_stats[pipe] = I915_READ(reg);
3198
3199 /* Clear the PIPE*STAT regs before the IIR */
3200 if (pipe_stats[pipe] & 0x8000ffff) {
3201 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
3202 DRM_DEBUG_DRIVER("pipe %c underrun\n",
3203 pipe_name(pipe));
3204 I915_WRITE(reg, pipe_stats[pipe]);
3205 irq_received = true;
3206 }
3207 }
3208 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3209
3210 if (!irq_received)
3211 break;
3212
3213 /* Consume port. Then clear IIR or we'll miss events */
3214 if ((I915_HAS_HOTPLUG(dev)) &&
3215 (iir & I915_DISPLAY_PORT_INTERRUPT)) {
3216 u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
3217 u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
3218
3219 DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
3220 hotplug_status);
3221
3222 intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
3223
3224 I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
3225 POSTING_READ(PORT_HOTPLUG_STAT);
3226 }
3227
3228 I915_WRITE(IIR, iir & ~flip_mask);
3229 new_iir = I915_READ(IIR); /* Flush posted writes */
3230
3231 if (iir & I915_USER_INTERRUPT)
3232 notify_ring(dev, &dev_priv->ring[RCS]);
3233
3234 for_each_pipe(pipe) {
3235 int plane = pipe;
3236 if (IS_MOBILE(dev))
3237 plane = !plane;
3238
3239 if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS &&
3240 i915_handle_vblank(dev, plane, pipe, iir))
3241 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(plane);
3242
3243 if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
3244 blc_event = true;
3245 }
3246
3247 if (blc_event || (iir & I915_ASLE_INTERRUPT))
3248 intel_opregion_asle_intr(dev);
3249
3250 /* With MSI, interrupts are only generated when iir
3251 * transitions from zero to nonzero. If another bit got
3252 * set while we were handling the existing iir bits, then
3253 * we would never get another interrupt.
3254 *
3255 * This is fine on non-MSI as well, as if we hit this path
3256 * we avoid exiting the interrupt handler only to generate
3257 * another one.
3258 *
3259 * Note that for MSI this could cause a stray interrupt report
3260 * if an interrupt landed in the time between writing IIR and
3261 * the posting read. This should be rare enough to never
3262 * trigger the 99% of 100,000 interrupts test for disabling
3263 * stray interrupts.
3264 */
3265 ret = IRQ_HANDLED;
3266 iir = new_iir;
3267 } while (iir & ~flip_mask);
3268
3269 i915_update_dri1_breadcrumb(dev);
3270
3271 return ret;
3272}
3273
3274static void i915_irq_uninstall(struct drm_device * dev)
3275{
3276 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3277 int pipe;
3278
3279 del_timer_sync(&dev_priv->hotplug_reenable_timer);
3280
3281 if (I915_HAS_HOTPLUG(dev)) {
3282 I915_WRITE(PORT_HOTPLUG_EN, 0);
3283 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3284 }
3285
3286 I915_WRITE16(HWSTAM, 0xffff);
3287 for_each_pipe(pipe) {
3288 /* Clear enable bits; then clear status bits */
3289 I915_WRITE(PIPESTAT(pipe), 0);
3290 I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe)));
3291 }
3292 I915_WRITE(IMR, 0xffffffff);
3293 I915_WRITE(IER, 0x0);
3294
3295 I915_WRITE(IIR, I915_READ(IIR));
3296}
3297
3298static void i965_irq_preinstall(struct drm_device * dev)
3299{
3300 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3301 int pipe;
3302
3303 atomic_set(&dev_priv->irq_received, 0);
3304
3305 I915_WRITE(PORT_HOTPLUG_EN, 0);
3306 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3307
3308 I915_WRITE(HWSTAM, 0xeffe);
3309 for_each_pipe(pipe)
3310 I915_WRITE(PIPESTAT(pipe), 0);
3311 I915_WRITE(IMR, 0xffffffff);
3312 I915_WRITE(IER, 0x0);
3313 POSTING_READ(IER);
3314}
3315
3316static int i965_irq_postinstall(struct drm_device *dev)
3317{
3318 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3319 u32 enable_mask;
3320 u32 error_mask;
3321
3322 /* Unmask the interrupts that we always want on. */
3323 dev_priv->irq_mask = ~(I915_ASLE_INTERRUPT |
3324 I915_DISPLAY_PORT_INTERRUPT |
3325 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
3326 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
3327 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3328 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |
3329 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
3330
3331 enable_mask = ~dev_priv->irq_mask;
3332 enable_mask &= ~(I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3333 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT);
3334 enable_mask |= I915_USER_INTERRUPT;
3335
3336 if (IS_G4X(dev))
3337 enable_mask |= I915_BSD_USER_INTERRUPT;
3338
3339 i915_enable_pipestat(dev_priv, 0, PIPE_GMBUS_EVENT_ENABLE);
3340
3341 /*
3342 * Enable some error detection, note the instruction error mask
3343 * bit is reserved, so we leave it masked.
3344 */
3345 if (IS_G4X(dev)) {
3346 error_mask = ~(GM45_ERROR_PAGE_TABLE |
3347 GM45_ERROR_MEM_PRIV |
3348 GM45_ERROR_CP_PRIV |
3349 I915_ERROR_MEMORY_REFRESH);
3350 } else {
3351 error_mask = ~(I915_ERROR_PAGE_TABLE |
3352 I915_ERROR_MEMORY_REFRESH);
3353 }
3354 I915_WRITE(EMR, error_mask);
3355
3356 I915_WRITE(IMR, dev_priv->irq_mask);
3357 I915_WRITE(IER, enable_mask);
3358 POSTING_READ(IER);
3359
3360 I915_WRITE(PORT_HOTPLUG_EN, 0);
3361 POSTING_READ(PORT_HOTPLUG_EN);
3362
3363 i915_enable_asle_pipestat(dev);
3364
3365 return 0;
3366}
3367
3368static void i915_hpd_irq_setup(struct drm_device *dev)
3369{
3370 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3371 struct drm_mode_config *mode_config = &dev->mode_config;
3372 struct intel_encoder *intel_encoder;
3373 u32 hotplug_en;
3374
3375 assert_spin_locked(&dev_priv->irq_lock);
3376
3377 if (I915_HAS_HOTPLUG(dev)) {
3378 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
3379 hotplug_en &= ~HOTPLUG_INT_EN_MASK;
3380 /* Note HDMI and DP share hotplug bits */
3381 /* enable bits are the same for all generations */
3382 list_for_each_entry(intel_encoder, &mode_config->encoder_list, base.head)
3383 if (dev_priv->hpd_stats[intel_encoder->hpd_pin].hpd_mark == HPD_ENABLED)
3384 hotplug_en |= hpd_mask_i915[intel_encoder->hpd_pin];
3385 /* Programming the CRT detection parameters tends
3386 to generate a spurious hotplug event about three
3387 seconds later. So just do it once.
3388 */
3389 if (IS_G4X(dev))
3390 hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
3391 hotplug_en &= ~CRT_HOTPLUG_VOLTAGE_COMPARE_MASK;
3392 hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
3393
3394 /* Ignore TV since it's buggy */
3395 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
3396 }
3397}
3398
3399static irqreturn_t i965_irq_handler(int irq, void *arg)
3400{
3401 struct drm_device *dev = (struct drm_device *) arg;
3402 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3403 u32 iir, new_iir;
3404 u32 pipe_stats[I915_MAX_PIPES];
3405 unsigned long irqflags;
3406 int irq_received;
3407 int ret = IRQ_NONE, pipe;
3408 u32 flip_mask =
3409 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |
3410 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT;
3411
3412 atomic_inc(&dev_priv->irq_received);
3413
3414 iir = I915_READ(IIR);
3415
3416 for (;;) {
3417 bool blc_event = false;
3418
3419 irq_received = (iir & ~flip_mask) != 0;
3420
3421 /* Can't rely on pipestat interrupt bit in iir as it might
3422 * have been cleared after the pipestat interrupt was received.
3423 * It doesn't set the bit in iir again, but it still produces
3424 * interrupts (for non-MSI).
3425 */
3426 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3427 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
3428 i915_handle_error(dev, false);
3429
3430 for_each_pipe(pipe) {
3431 int reg = PIPESTAT(pipe);
3432 pipe_stats[pipe] = I915_READ(reg);
3433
3434 /*
3435 * Clear the PIPE*STAT regs before the IIR
3436 */
3437 if (pipe_stats[pipe] & 0x8000ffff) {
3438 if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
3439 DRM_DEBUG_DRIVER("pipe %c underrun\n",
3440 pipe_name(pipe));
3441 I915_WRITE(reg, pipe_stats[pipe]);
3442 irq_received = 1;
3443 }
3444 }
3445 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3446
3447 if (!irq_received)
3448 break;
3449
3450 ret = IRQ_HANDLED;
3451
3452 /* Consume port. Then clear IIR or we'll miss events */
3453 if (iir & I915_DISPLAY_PORT_INTERRUPT) {
3454 u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
3455 u32 hotplug_trigger = hotplug_status & (IS_G4X(dev) ?
3456 HOTPLUG_INT_STATUS_G4X :
3457 HOTPLUG_INT_STATUS_I915);
3458
3459 DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
3460 hotplug_status);
3461
3462 intel_hpd_irq_handler(dev, hotplug_trigger,
3463 IS_G4X(dev) ? hpd_status_gen4 : hpd_status_i915);
3464
3465 I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
3466 I915_READ(PORT_HOTPLUG_STAT);
3467 }
3468
3469 I915_WRITE(IIR, iir & ~flip_mask);
3470 new_iir = I915_READ(IIR); /* Flush posted writes */
3471
3472 if (iir & I915_USER_INTERRUPT)
3473 notify_ring(dev, &dev_priv->ring[RCS]);
3474 if (iir & I915_BSD_USER_INTERRUPT)
3475 notify_ring(dev, &dev_priv->ring[VCS]);
3476
3477 for_each_pipe(pipe) {
3478 if (pipe_stats[pipe] & PIPE_START_VBLANK_INTERRUPT_STATUS &&
3479 i915_handle_vblank(dev, pipe, pipe, iir))
3480 flip_mask &= ~DISPLAY_PLANE_FLIP_PENDING(pipe);
3481
3482 if (pipe_stats[pipe] & PIPE_LEGACY_BLC_EVENT_STATUS)
3483 blc_event = true;
3484 }
3485
3486
3487 if (blc_event || (iir & I915_ASLE_INTERRUPT))
3488 intel_opregion_asle_intr(dev);
3489
3490 if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
3491 gmbus_irq_handler(dev);
3492
3493 /* With MSI, interrupts are only generated when iir
3494 * transitions from zero to nonzero. If another bit got
3495 * set while we were handling the existing iir bits, then
3496 * we would never get another interrupt.
3497 *
3498 * This is fine on non-MSI as well, as if we hit this path
3499 * we avoid exiting the interrupt handler only to generate
3500 * another one.
3501 *
3502 * Note that for MSI this could cause a stray interrupt report
3503 * if an interrupt landed in the time between writing IIR and
3504 * the posting read. This should be rare enough to never
3505 * trigger the 99% of 100,000 interrupts test for disabling
3506 * stray interrupts.
3507 */
3508 iir = new_iir;
3509 }
3510
3511 i915_update_dri1_breadcrumb(dev);
3512
3513 return ret;
3514}
3515
3516static void i965_irq_uninstall(struct drm_device * dev)
3517{
3518 drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
3519 int pipe;
3520
3521 if (!dev_priv)
3522 return;
3523
3524 del_timer_sync(&dev_priv->hotplug_reenable_timer);
3525
3526 I915_WRITE(PORT_HOTPLUG_EN, 0);
3527 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
3528
3529 I915_WRITE(HWSTAM, 0xffffffff);
3530 for_each_pipe(pipe)
3531 I915_WRITE(PIPESTAT(pipe), 0);
3532 I915_WRITE(IMR, 0xffffffff);
3533 I915_WRITE(IER, 0x0);
3534
3535 for_each_pipe(pipe)
3536 I915_WRITE(PIPESTAT(pipe),
3537 I915_READ(PIPESTAT(pipe)) & 0x8000ffff);
3538 I915_WRITE(IIR, I915_READ(IIR));
3539}
3540
3541static void i915_reenable_hotplug_timer_func(unsigned long data)
3542{
3543 drm_i915_private_t *dev_priv = (drm_i915_private_t *)data;
3544 struct drm_device *dev = dev_priv->dev;
3545 struct drm_mode_config *mode_config = &dev->mode_config;
3546 unsigned long irqflags;
3547 int i;
3548
3549 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3550 for (i = (HPD_NONE + 1); i < HPD_NUM_PINS; i++) {
3551 struct drm_connector *connector;
3552
3553 if (dev_priv->hpd_stats[i].hpd_mark != HPD_DISABLED)
3554 continue;
3555
3556 dev_priv->hpd_stats[i].hpd_mark = HPD_ENABLED;
3557
3558 list_for_each_entry(connector, &mode_config->connector_list, head) {
3559 struct intel_connector *intel_connector = to_intel_connector(connector);
3560
3561 if (intel_connector->encoder->hpd_pin == i) {
3562 if (connector->polled != intel_connector->polled)
3563 DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
3564 drm_get_connector_name(connector));
3565 connector->polled = intel_connector->polled;
3566 if (!connector->polled)
3567 connector->polled = DRM_CONNECTOR_POLL_HPD;
3568 }
3569 }
3570 }
3571 if (dev_priv->display.hpd_irq_setup)
3572 dev_priv->display.hpd_irq_setup(dev);
3573 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3574}
3575
3576void intel_irq_init(struct drm_device *dev)
3577{
3578 struct drm_i915_private *dev_priv = dev->dev_private;
3579
3580 INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
3581 INIT_WORK(&dev_priv->gpu_error.work, i915_error_work_func);
3582 INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work);
3583 INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work);
3584
3585 setup_timer(&dev_priv->gpu_error.hangcheck_timer,
3586 i915_hangcheck_elapsed,
3587 (unsigned long) dev);
3588 setup_timer(&dev_priv->hotplug_reenable_timer, i915_reenable_hotplug_timer_func,
3589 (unsigned long) dev_priv);
3590
3591 pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
3592
3593 dev->driver->get_vblank_counter = i915_get_vblank_counter;
3594 dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
3595 if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
3596 dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */
3597 dev->driver->get_vblank_counter = gm45_get_vblank_counter;
3598 }
3599
3600 if (drm_core_check_feature(dev, DRIVER_MODESET))
3601 dev->driver->get_vblank_timestamp = i915_get_vblank_timestamp;
3602 else
3603 dev->driver->get_vblank_timestamp = NULL;
3604 dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
3605
3606 if (IS_VALLEYVIEW(dev)) {
3607 dev->driver->irq_handler = valleyview_irq_handler;
3608 dev->driver->irq_preinstall = valleyview_irq_preinstall;
3609 dev->driver->irq_postinstall = valleyview_irq_postinstall;
3610 dev->driver->irq_uninstall = valleyview_irq_uninstall;
3611 dev->driver->enable_vblank = valleyview_enable_vblank;
3612 dev->driver->disable_vblank = valleyview_disable_vblank;
3613 dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
3614 } else if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) {
3615 /* Share uninstall handlers with ILK/SNB */
3616 dev->driver->irq_handler = ivybridge_irq_handler;
3617 dev->driver->irq_preinstall = ivybridge_irq_preinstall;
3618 dev->driver->irq_postinstall = ivybridge_irq_postinstall;
3619 dev->driver->irq_uninstall = ironlake_irq_uninstall;
3620 dev->driver->enable_vblank = ivybridge_enable_vblank;
3621 dev->driver->disable_vblank = ivybridge_disable_vblank;
3622 dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
3623 } else if (HAS_PCH_SPLIT(dev)) {
3624 dev->driver->irq_handler = ironlake_irq_handler;
3625 dev->driver->irq_preinstall = ironlake_irq_preinstall;
3626 dev->driver->irq_postinstall = ironlake_irq_postinstall;
3627 dev->driver->irq_uninstall = ironlake_irq_uninstall;
3628 dev->driver->enable_vblank = ironlake_enable_vblank;
3629 dev->driver->disable_vblank = ironlake_disable_vblank;
3630 dev_priv->display.hpd_irq_setup = ibx_hpd_irq_setup;
3631 } else {
3632 if (INTEL_INFO(dev)->gen == 2) {
3633 dev->driver->irq_preinstall = i8xx_irq_preinstall;
3634 dev->driver->irq_postinstall = i8xx_irq_postinstall;
3635 dev->driver->irq_handler = i8xx_irq_handler;
3636 dev->driver->irq_uninstall = i8xx_irq_uninstall;
3637 } else if (INTEL_INFO(dev)->gen == 3) {
3638 dev->driver->irq_preinstall = i915_irq_preinstall;
3639 dev->driver->irq_postinstall = i915_irq_postinstall;
3640 dev->driver->irq_uninstall = i915_irq_uninstall;
3641 dev->driver->irq_handler = i915_irq_handler;
3642 dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
3643 } else {
3644 dev->driver->irq_preinstall = i965_irq_preinstall;
3645 dev->driver->irq_postinstall = i965_irq_postinstall;
3646 dev->driver->irq_uninstall = i965_irq_uninstall;
3647 dev->driver->irq_handler = i965_irq_handler;
3648 dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
3649 }
3650 dev->driver->enable_vblank = i915_enable_vblank;
3651 dev->driver->disable_vblank = i915_disable_vblank;
3652 }
3653}
3654
3655void intel_hpd_init(struct drm_device *dev)
3656{
3657 struct drm_i915_private *dev_priv = dev->dev_private;
3658 struct drm_mode_config *mode_config = &dev->mode_config;
3659 struct drm_connector *connector;
3660 unsigned long irqflags;
3661 int i;
3662
3663 for (i = 1; i < HPD_NUM_PINS; i++) {
3664 dev_priv->hpd_stats[i].hpd_cnt = 0;
3665 dev_priv->hpd_stats[i].hpd_mark = HPD_ENABLED;
3666 }
3667 list_for_each_entry(connector, &mode_config->connector_list, head) {
3668 struct intel_connector *intel_connector = to_intel_connector(connector);
3669 connector->polled = intel_connector->polled;
3670 if (!connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
3671 connector->polled = DRM_CONNECTOR_POLL_HPD;
3672 }
3673
3674 /* Interrupt setup is already guaranteed to be single-threaded, this is
3675 * just to make the assert_spin_locked checks happy. */
3676 spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
3677 if (dev_priv->display.hpd_irq_setup)
3678 dev_priv->display.hpd_irq_setup(dev);
3679 spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
3680}
Linux kernel - Deliverables
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